Beware that thou bring not my son thither again. If the woman should not be found willing, Abraham, commending the event to God, firmly adheres to the principal point, that his son Isaac should not return to his country, because in this manner he would have deprived himself of the promised inheritance. He therefore chooses rather to live by hope, as a stranger, in the land of Canaan, than to rest among his relatives in his native soil: and thus we see that, in perplexed and confused affairs, the mind of the holy man was not drawn aside from the command of God by any agitating cares; and we are taught, by his example, to follow God through every obstacle. However, he afterwards declares that he looks for better things. By such words he confirms the confidence of his servant, so that he, anticipating with greater alacrity a prosperous issue, might prepare for the journey.

And Abraham said unto him, Beware thou that thou bring not my son (d) thither again.
(d) Lest he should love the inheritance promised.

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.