Commentaries:
Jamieson, Fausset, and Brown
Of whom—rather as Greek "He (Abraham, not Isaac) TO whom it was said" [ALFORD]. BENGEL supports English Version. So Hebrews 1:7 uses the same Greek preposition, "unto," for "in respect to," or "of." This verse gives a definition of the "only-begotten Son" (Hebrews 11:17).
in Isaac shall thy seed be called— (Genesis 21:12). The posterity of Isaac alone shall be accounted as the seed of Abraham, which is the heir of the promises (Romans 9:7).
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