Jeremiah
Jeremiah 31:19BSB·traditional attribution

After I returned, I repented; and after I was instructed, I struck my thigh in grief. I was ashamed and humiliated because I bore the disgrace of my youth.’

John Calvin Reformed @genevareformer

Jeremiah now proceeds with what he had before briefly touched upon, even to shew that the punishment inflicted on the Israelites had not been without its fruit. And this is a doctrine which ought especially to be known, for we always shun whatever is hard to the flesh; so that if it were according to our own will, the chastisements of God would never be well received by us.

Matthew Henry Presbyterian @wholebiblehenry

We have here, I. Ephraim's repentance, and return to God. Not only Judah, but Ephraim the ten tribes, shall be restored, and therefore shall thus be prepared and qualified for it, Hos 14:8. Ephraim shall say, What have I do to any more with idols?

Commenting on Jeremiah 31:18-26

John Gill Reformed Baptist @doctorgill

Surely after that I was turned I repented,.... Ephraim's prayer was answered; as he prayed he might be turned, he was; and when he was turned, then he repented, not only of sin in general, but of such sins as he had been particularly guilty of; not only of the grosser actions of life, but of inward sins, secret lusts and corruptions; even of sins...