(8) Lord God.--Heb., Lord Jehovah, as in Genesis 15:2.

Whereby shall I know that I shall inherit it?--Jehovah had required Abram to leave his home in Ur of the Chaldees on a general promise of future endowment with the land of Canaan. Abram now asks this question, not from want of faith, but from a desire for a more direct confirmation of the promise and fuller knowledge of the details. What Abram, therefore, receives is an exact and circumstantial prophecy, made in the form of a solemn covenant.

Verse 8. - And he said, Lord God (Adonai Jehovah; vide Ver. 2), whereby shall I know that I shall inherit it? Not the language of doubt, though slight misgivings are not incompatible with faith (cf. Judges 6:17; 2 Kings 20:8; Luke 1:34), and questioning with God "is rather a proof of faith than a sign of incredulity" (Calvin); but of desire for a sign in confirmation of the grant (Luther), either for the strengthening of his own faith (Chrysostom, Augustine, Keil, 'Speaker's Commentary'), or for the sake of his posterity (Jarchi, Michaelis), or for some intimation as to the time and mode of taking possession (Murphy). Rosenmüller conceives the question put in Abram's mouth to be only a device of the narrator's to lead up to the subject following.

15:7-11 Assurance was given to Abram of the land of Canaan for an inheritance. God never promises more than he is able to perform, as men often do. Abram did as God commanded him. He divided the beasts in the midst, according to the ceremony used in confirming covenants, Jer 34:18,19. Having prepared according to God's appointment, he set himself to wait for the sign God might give him. A watch must be kept upon our spiritual sacrifices. When vain thoughts, like these fowls, come down upon our sacrifices, we must drive them away, and seek to attend on God without distraction.And he said, Lord God, whereby shall I know that I shall inherit it? Not as questioning or doubting whether he should or not; but this he asked for the further confirmation of his faith in the promise, and for the sake of his posterity, that they might more easily and strongly believe that they should inherit the land given and promised to them; nor is it culpable to ask a sign of God with such a view; good men have done it, as Gideon, Judges 6:36, and Hezekiah, 2 Kings 20:8, without being blamed for it; yea, Ahaz is blamed for not asking one, Isaiah 7:10.