Repentance and the Mosaic Law in the New Testament
Question
Why do theologians not see it was repentance from breaking the Mosaic law? Now, we’re talking about repentance in the New Testament.
Originally published in Vol. 1, Number 9, September 2026, Ask The Theologian Journal.
Answer
In many New Testament contexts, repentance is best understood in relation to Israel’s covenant under the Mosaic law, rather than as a generic moral reform or a mere change of opinion. Modern theology often detaches repentance from that covenant setting, which leads to confusion and to private redefinitions of the word.
The Greek term commonly translated “repent” points etymologically to a change of mind. Yet, in actual usage, the word carries the sense of turning from a course of action to another course, especially in a covenantal relationship. Language is defined by usage, not merely by its etymological parts.
Repentance in Israel’s Covenant Framework
Israel’s life with God was regulated by the Mosaic covenant. Blessings and curses were explicitly tied to obedience and disobedience. When Israel strayed from the law, the call to “return” was a call to come back into faithful covenant observance.
Deuteronomy 30:1–3 gives a paradigmatic picture:
“And it shall come to pass, when all these things are come upon thee, the blessing and the curse, which I have set before thee, and thou shalt call them to mind among all the nations, whither the Lord thy God hath driven thee, and shalt return unto the Lord thy God, and shalt obey his voice according to all that I command thee this day, thou and thy children, with all thine heart, and with all thy soul; That then the Lord thy God will turn thy captivity, and have compassion upon thee, and will return and gather thee from all the nations, whither the Lord thy God hath scattered thee.”
Here, the movement is clear:
Israel experiences the curse for covenant disobedience.
They “call to mind” the blessings and curses.
They “return unto the Lord” and obey what He commanded “this day” (the law).
Then God reverses their captivity and restores them.
Although the word “repent” is not used here in English, this passage describes exactly what repentance is for Israel: a return to the law’s covenant terms.
New Testament Calls to Repentance
When John the Baptist, the Lord Jesus, and Peter call Israel to repent, they are speaking within this Deuteronomic framework.
For example, Peter in Acts 2:38 says:
“Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins …”
His audience is “all the house of Israel” (Acts 2:36). Their sins include rejecting and crucifying their Messiah, which is itself a violation of the covenant. To repent here is to turn back from their breach, acknowledge their sin against the Holy One, and come into covenant faithfulness as defined under the law and its prophetic fulfillment in the Messiah.
Likewise, in Acts 3:13–15, Peter indicts them:
“The God of Abraham, and of Isaac, and of Jacob, the God of our fathers, hath glorified his Son Jesus; whom ye delivered up, and denied him in the presence of Pilate, when he was determined to let him go. But ye denied the Holy One and the Just, and desired a murderer to be granted unto you; And killed the Prince of life …”
This behavior is utterly contrary to the standards of the law, even when not quoting a specific verse. When Peter then calls them to repent, it is a call to return to the blessings and curses and to align with God’s covenant purposes for Israel through the Messiah.
Thus, unless a context clearly specifies otherwise, repentance in the Gospels and Acts is best read as a call for Israel to turn from breaking the Mosaic law and its covenant responsibilities, and to return to the God of that covenant in obedient faith.
Why Many Theologians Miss the Mosaic Focus
Several factors contribute to theologians overlooking this covenantal dimension:
Theological systems that flatten Scripture. Covenant theology and much of evangelical theology often merge Israel and the church into one people of God and blur the distinction between the kingdom program for Israel and the Pauline revelation of the body of Christ. In such a system, Israel’s specific covenant context is minimized, and “repentance” gets generalized.
Private redefinitions of “repent.” Some teachers, concerned to protect “grace alone” from perceived threats, insist that repentance must never mean a behavioral turning, only an internal change of mind. This creates a private theological dictionary that does not match the way the word is actually used in Scripture or in ordinary language.
Fear of adding works to the gospel. There is a legitimate concern not to add works to justification by grace through faith. But the solution is to rightly divide Israel’s kingdom message from Paul’s gospel, not to redefine vocabulary. When we try to force Acts 2 or 3 into Paul’s gospel of pure grace, we are compelled either to add works or to twist words.
Repentance and the Pauline Gospel
In the gospel of the grace of God revealed to Paul, justification is by faith without works of the law. Crucially, in Paul’s clear salvation texts for this age, repentance is not made a condition for obtaining eternal life in the way it is preached in the kingdom context.
Paul proclaims faith in the crucified and risen Christ as the sole condition for justification, apart from works. When he addresses repentance, it is often in the realm of believers’ conduct and correction, or in relation to Israel as a nation, rather than as an added requirement for the individual Gentile believer’s justification.
Therefore, we do not need to redefine repentance to protect grace. We need to recognize that the New Testament uses the word in covenantal, kingdom-oriented contexts primarily relating to Israel, and that Paul’s distinct revelation handles justification on a different basis.
Objective Meaning Versus Private Dictionaries
Words must be taken according to their objective usage. If, in common usage and in Scripture, “repent” means to turn from a course of behavior to another, we cannot simply insist that in theological discourse it only means “change your mind” in a purely internal, non-behavioral sense.
Language changes over time. For instance, older literature may describe people as having a “gay” time, meaning cheerful. Today, that word carries a very different primary meaning. We do not get to impose an older sense when current usage and context clearly indicate another.
Similarly, in Scripture and in theological parlance, “repent” has come to mean a turning from sin or error toward God and obedience. The context of Israel under the Mosaic law shapes that meaning in the Gospels and Acts. To deny that covenantal and behavioral dimension is to create a private theological lexicon that soon collapses under the text’s own usage.
The better way is:
Acknowledge that New Testament calls to repentance, especially before and in early Acts, are calls for Israel to turn from covenant-breaking and return to Mosaic faithfulness centered in their Messiah.
Recognize that this kingdom call is not the same as the Pauline offer of justification to Jew and Gentile alike by grace through faith apart from law works.
When we keep Israel’s law covenant in view and rightly divide the times and audiences, it becomes clear that repentance in those New Testament passages is indeed bound up with breaking the Mosaic law, and that much modern theology misses this because it does not preserve those biblical distinctions.