John Gill Commentary Jeremiah 2:21

"Yet I had planted thee a noble vine, wholly a right seed: how then art thou turned into the degenerate branches of a foreign vine unto me?" — Jeremiah 2:21 (ASV)

Yet I had planted you a noble vine, wholly a right seed
It is usual to compare the people of the Jews to a vineyard, and to vines; and their settlement in the land of Canaan to the planting of vines in a vineyard; see (Isaiah 5:1–7) (Exodus 15:17) (Psalms 80:8–15) . Kimchi says this is spoken concerning Abraham; no doubt respect is had to the Jewish fathers, such as Abraham, Isaac, and Jacob, the twelve patriarchs, Moses, Joshua, and Caleb, and the like; who, having the true and right seed of grace in them, became like choice and noble vines, and brought forth much fruit, and were deserving of imitation by their posterity:

how then are you turned into the degenerate plant of a strange vine
unto me ?
like a vine that grows in the woods, and brings forth wild grapes; so these, their sons, degenerating in practice from their fathers, became corrupt in themselves, and unprofitable to God.

The Targum of the whole is, ``I set you before me as the plant of a choice vine, all of you doing truth; but how are you changed before me in your corrupt works? you have declined from my worship, you are become as a vine in which there is no profit.''