But if the wicked will turn from all his sins that he hath committed, and keep all my {d} statutes, and do that which is lawful and right, he shall surely live, he shall not die.

(d) He joins the observation of the commandments with repentance; for none can repent indeed, unless he labour to keep the Law.

Jamieson-Fausset-Brown Bible Commentary

21-24. Two last cases, showing the equity of God: (1) The penitent sinner is dealt with according to his new obedience, not according to his former sins. (2) The righteous man who turns from righteousness to sin shall be punished for the latter, and his former righteousness will be of no avail to him.

he shall surely live-Despair drives men into hardened recklessness; God therefore allures men to repentance by holding out hope [Calvin].

To threats the stubborn sinner oft is hard,

Wrapt in his crimes, against the storm prepared,

But when the milder beams of mercy play,

He melts, and throws the cumbrous cloak away.

Hitherto the cases had been of a change from bad to good, or vice versa, in one generation compared with another. Here it is such a change in one and the same individual. This, as practically affecting the persons here addressed, is properly put last. So far from God laying on men the penalty of others' sins, He will not even punish them for their own, if they turn from sin to righteousness; but if they turn from righteousness to sin, they must expect in justice that their former goodness will not atone for subsequent sin (Heb 10:38, 39; 2Pe 2:20-22). The exile in Babylon gave a season for repentance of those sins which would have brought death on the perpetrator in Judea while the law could be enforced; so it prepared the way for the Gospel [Grotius].

Matthew Henry's Concise Commentary

18:21-29 The wicked man would be saved, if he turned from his evil ways. The true penitent is a true believer. None of his former transgressions shall be mentioned unto him, but in the righteousness which he has done, as the fruit of faith and the effect of conversion, he shall surely live. The question is not whether the truly righteous ever become apostates. It is certain that many who for a time were thought to be righteous, do so, while ver. 26,27 speaks the fulness of pardoning mercy: when sin is forgiven, it is blotted out, it is remembered no more. In their righteousness they shall live; not for their righteousness, as if that were an atonement for their sins, but in their righteousness, which is one of the blessings purchased by the Mediator. What encouragement a repenting, returning sinner has to hope for pardon and life according to this promise! In verse 28 is the beginning and progress of repentance. True believers watch and pray, and continue to the end, and they are saved. In all our disputes with God, he is in the right, and we are in the wrong.