I have heard — The prophet here shews the change that would be wrought in the hearts of the Israelites preceding this return from their captivity. As a bullock — Which ordinarily are very unruly when they are first put into it.
Related Commentaries of Jeremiah 31:18
Jeremiah 31:18
18 I have surely heard Ephraim bemoaning himself thus; Thou hast chastised me, and I was chastised, as a bullock unaccustomed to the yoke: turn thou me, and I shall be turned; for thou art the LORD my God.