Jeremiah 12:15

I will return, and have compassion on them - This is a promise of restoration from the captivity, and an intimation also that some of their enemies would turn to the true God with them; learn the ways of his people; that is, would abjure idols, and take Jehovah for their God; and be built in the midst of his people, that is, Jew and Gentile forming one Church of the Most High.