Thus Abraham had better authority for his divorce from Hagar than he had for his marriage with her, Genesis 16:2. Thy seed, to wit, the promised Seed, the heir of thy estate, covenant, and promises, the progenitor of my church and people, and particularly of the Messias. Called, i.e. reputed and valued, both by me and other men. The words may be thus rendered, by Isaac shall thy seed be; for to be called is ofttimes put for to be, as Isaiah 1:26, Isaiah 47:1,5 Mt 5:9,19.
Related Commentaries of Genesis 21:12
Genesis 21:12
12 And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.