John Gill Bible Commentary

And Abraham said unto him,.... Not blaming him for putting such a question, nor charging him with impertinence, but plainly seeing the propriety of it: and in order to clear up this matter to him, gives the following instructions: beware thou, that thou bring not my son thither again; for the command to come out of the land of Chaldea, never to return more, and to come into the land of Canaan, and there abide, respected both Abraham and his posterity; and besides, it was dangerous for Isaac to go into a family, where, though there was some knowledge of the true God, yet there was much superstition and idolatry in it, as appears by various hints in the sequel of this history, lest he should be corrupted, and degenerate from the true religion.