John Gill Bible Commentary

If they shall confess their iniquity, and the iniquity of their fathers,.... The Targum of Jonathan adds,"in the time of their distress;''which might serve to bring their sins to remembrance, and them to a confession of them, not only of their own sins, but of their fathers' also; acknowledging thereby that they had been guilty of sinning against God for a long course of years past; and that God had been long suffering towards them, and bore much with them before he brought his judgments on them, which were just, and what they righteously deserved; and such a confession Daniel made, Dan 9:4; and the words may as well be rendered absolute as conditional, or better, and as a prediction of what would be done by them when in captivity and distress, "and they shall confess their iniquity" (c); with shame and sorrow, with repentance for it, and abhorrence of it; or otherwise, if the confession was only verbal and hypocritical, it would not be acceptable: with their trespass which they trespassed against me; along with their own iniquities, and those of their fathers, they should confess, their trespass against the Lord would be acknowledged by them; which seems to design some particular and grievous sin committed by them, by which perhaps is meant their idolatry, a capital sin, directly against God, and what those people were prone unto: and that also they have walked contrary unto me; to his mind and will, to his laws, commands, statutes, and ordinances, disregarding him and them, as if enemies to him; or "by chance"; See Gill on Lev 26:21. (c) "et confitebuntur", Pagninus, Montanus.