From Lord to Father: Why the Language Changed

Have you ever noticed that in the Old Testament, God's people almost never call Him Father? They call Him LORD, Adonai, El Shaddai, the Holy One of Israel. They bow before a King and they tremble before a Master. But they do not call Him "Abba."

And yet in the New Testament, that is exactly what we are told to do. Many people (including Orthodox Jews) are confused by this (i.e. "If He's the same God, why did the language change"). Well there's a great explanation for it and not just that, God prophesied it.

He told them they would call Him Father

Right in the middle of Jeremiah 3, the same chapter where God hands Israel the certificate of divorce and calls her an unfaithful wife, He says something remarkable.

"But I said: 'How can I put you among the children and give you a pleasant land, a beautiful heritage of the hosts of nations?' And I said: 'You shall call Me, "My Father," and not turn away from Me.'" (Jeremiah 3:19, NKJV)

אָבִי תִּקְרְאִי־לִי avi tiqre'i-li, "My Father, you shall call Me." A promise, not a description. God is looking forward. And He places it one verse before He says, "Surely, as a wife treacherously departs from her husband, so have you dealt treacherously with Me, O house of Israel" (Jeremiah 3:20).

Father language and husband language, side by side. Both are coming, but neither has fully arrived at this point in scripture. Hosea carries the same thread. The children born under the old marriage, named "No Mercy" and "Not My People," are the very ones God promises will one day be called בְּנֵי אֵל־חָי benei El-chai, "sons of the living God" (Hosea 1:10). Even the children of the unfaithful bride will be reclaimed as sons.

And Isaiah, twice:

"You, O LORD, are our Father; our Redeemer from Everlasting is Your name" (Isaiah 63:16), and "But now, O LORD, You are our Father; we are the clay, and You our potter" (Isaiah 64:8).

But these are cries, not casual address. Moments of desperate appeal, not the everyday language of the relationship. Israel knew God was their Father in some sense. They just did not live in that room of the house.

Why they didn't, and why it makes sense

Under the old covenant, the relationship was governed by the Law, the marriage contract (as I explained previously). And the Law puts you in the posture of a servant. You obey or face consequences. You perform or fall short. The dominant experience is obligation, reverence, and distance. You call that kind of authority "Lord." You do not call it "Dad." Even the husband word God uses in Hosea carries that weight: בַּעְלִי ba'li means "my master" or "my owner." And God Himself prophesied the day that would change: "You will call Me אִישִׁי ishi, 'My Husband,' and no longer call Me ba'li, 'My Master'" (Hosea 2:16, NKJV). Even within the marriage, the intimacy was future.

Paul explained this using an image every person in the Roman world would have recognized instantly.

In wealthy ancient households, a father's son did not grow up free. While the boy was a minor, the father assigned him a παιδαγωγός paidagogos, a household slave whose job was not to teach but to guard, escort, and discipline. The word tells you what it means: παῖς pais (child) and ἄγω agō (to lead). As William Ramsay documents in his Historical Commentary on Galatians, the paidagogoi "were trusted servants and faithful attendants, standing in a very close relation to the family (in which they were slaves). Their duty was not to teach any child under their charge, but simply to guard him." The formal teacher was the διδάσκαλος didaskalos. The paidagogos was the escort who got the boy to school and back alive. The heir outranked the slave, but until the father said the word, the boy lived under the slave's authority. For all practical purposes, he was no different from a servant even though the whole estate already belonged to him.

Paul lays the old covenant right on top of that picture.

"Therefore the law was our tutor to bring us to Christ, that we might be justified by faith. But after faith has come, we are no longer under a tutor. For you are all sons of God through faith in Christ Jesus." (Galatians 3:24-26, NKJV)

The word "tutor" is παιδαγωγός paidagogos. The Law was the guardian-slave walking the heir to school. Good. Necessary. But not the destination. The escort.

Then Paul presses further.

"Now I say that the heir, as long as he is a child, does not differ at all from a slave, though he is master of all, but is under guardians and stewards until the time appointed by the father." (Galatians 4:1-2, NKJV)

Until the time appointed by the father. In Roman custom, unlike Jewish practice, there was no fixed age when a son became a man. It happened when the father decided the boy was ready. As James Montgomery Boice documents (cited via David Guzik, Enduring Word), "A Roman child became an adult at the sacred family festival known as the Liberalia, held annually on the seventeenth of March. At this time the child was formally adopted by the father as his acknowledged son and heir and received the toga virilis in place of the toga praetexta which he had previously worn." The child took off the striped robe of a minor and put on the plain white toga of a full citizen. The guardian stepped aside. The son took his place at the table.

"But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, to redeem those who were under the law, that we might receive the adoption as sons. And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying out, 'Abba, Father!' Therefore you are no longer a slave but a son, and if a son, then an heir of God through Christ." (Galatians 4:4-7, NKJV)

The "fullness of time" is the date the Father appointed. The Son comes, born under the same Law the bride lived under, and redeems those under it. The result is not just freedom but family. The Spirit of the Son enters the believer's heart and puts a new word in their mouth, one the old covenant never carried as everyday language: Abba. Father.

Married to the Son, children of the Father

Here is where the marriage and the family language lock together.

Under the new covenant, the bride is joined to the Son (2 Corinthians 11:2; Ephesians 5:25-32; Revelation 19:7). The Son of whom? The Father. So by the simplest logic of marriage, the bride who is joined to the Son becomes a daughter of the groom's Father. That is not a theological abstraction. That is how families work. When you marry someone, you become the child of their father. His family becomes yours. His inheritance becomes yours.

And Jesus says exactly that, at exactly the right moment. After the resurrection, He tells Mary Magdalene:

"Go to My brethren and say to them, 'I am ascending to My Father and your Father, and to My God and your God.'" (John 20:17, NKJV)

Look at the timing... after the cross, after the old covenant has ended, after the Husband has died & risen... and here, for the first time in the Gospels, Jesus calls His disciples ἀδελφούς adelphous, "brothers." Not servants. Not students. Brothers. Then He names the family they now share: "My Father and your Father." Not "our Father" generically, as if He and they were sons the same way, but "My Father and your Father," linking their sonship to His. As Gill puts it, God is Christ's Father by nature, being His only begotten Son, and is the Father of His disciples by adopting grace, through their spiritual relation to Him as the natural and eternal Son of God. The family line runs through the Son. Because we are joined to Him, His Father is now our Father.

Now, a careful reader might ask "uhhh... how can Jesus be both our Husband and our Brother?" but it is not a contradiction because the two words do different jobs. "Bridegroom" describes the covenant union while "Brother" describes the family status that union creates before the Father.

Scripture already holds them together. In the Song of Solomon, the bridegroom calls his bride אֲחֹתִי כַלָּה achoti kallah, "my sister, my bride" (Song of Solomon 4:9, 12; 5:1, NKJV). Both terms, same person, same breath. And Hebrews 2:11 names the reason:

"For both He who sanctifies and those who are being sanctified are all of one, for which reason He is not ashamed to call them brethren" (NKJV).

Romans 8:29 calls Him πρωτότοκον ἐν πολλοῖς ἀδελφοῖς prōtotokon en pollois adelphois, "the firstborn among many brethren." He is the firstborn Son by nature; we are the younger siblings brought in through Him. The marriage creates the family access, and the family access produces the brotherhood. "Brother" is the fruit of being married to the Husband, because His Father becomes our Father, and children of the same Father are family.

Paul confirms the inheritance: "And if children, then heirs, heirs of God and joint heirs with Christ" (Romans 8:17, NKJV). Not separate heirs of a separate estate, but co-heirs with the Son of the Father's household. And the one who makes that possible is the Spirit of the Son Himself, placed in us, crying the family name: Abba, Father (Galatians 4:6).

So the language shift from Lord to Father is not merely a change of tone. It is the legal and relational consequence of a marriage. The bride under the Law called her God "Lord" because the contract demanded it. The bride joined to the Son calls His Father "Father" because that is what you call the father of the one you have married into. The whole family structure of the new covenant flows from the union with Christ.

The transition everyone recognizes

This is the most natural transition in human experience.

A student calls his teacher "sir." He follows the syllabus, meets the requirements, earns the degree. Years later, that same teacher invites him to dinner as a colleague and friend. The formality was not destroyed. It was fulfilled.

An apprentice calls his master "master." He does what he is told, learns the trade, practices under authority. Then, one day the master says, "You are ready. You are no longer my apprentice. You are my partner."

A son in a family business starts in the mailroom. He calls his father "Mr. Chairman" in the boardroom, not because the bond is not real, but because the context demands it. The day comes when the father hands him the keys: "This is yours now. Sit at my right hand."

That is what happened between the covenants. Israel was always God's child (Exodus 4:22, "Israel is My son, My firstborn") but the season was guardianship, and the language matched. They called Him Lord because they lived under His Law.

When the Son fulfilled that contract, when the old marriage reached its lawful end and the new betrothal began, the guardian stepped aside and the Spirit stepped in. The Spirit did not teach a new theology. He put a new word in the mouth: Abba. The word a child uses at home, not the word a servant uses in the court. The language changed because the covenant changed and God told them it was coming all along.

"But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ." 2 Corinthians 11:3


"At that time Jesus answered and said, "I thank You, Father, Lord of heaven and earth, that You have hidden these things from the wise and prudent and have revealed them to babes." Matthew 11:25


"He has shown you, O man, what is good; And what does the Lord require of you But to do justly, To love mercy, And to walk humbly with your God?" Micah 6:8

In my next article, I go over why the certain Old Testament laws carry over and why the rest didn't. When you read it things start to make a lot more sense.