Hebrews 11:18

18 God had said to him, "Your family line will continue through Isaac."(Genesis 21:12) Even so, Abraham was going to offer him up.

Hebrews 11:18 Meaning and Commentary

Hebrews 11:18

Of whom it is said
That is, of Isaac, Abraham's own son, whom he offered up; or rather, "to whom it was said", as the Vulgate Latin and Syriac versions render it; that is, to Abraham, for to him was this said, ( Genesis 21:12 )

that in Isaac shall thy seed be called;
that numerous natural seed of his, which should inherit the land of Canaan; and his special famous seed, the Messiah, to whom the promises were made; (See Gill on Romans 9:7).

Hebrews 11:18 In-Context

16 Instead, they longed for a better country. They wanted one in heaven. So God is pleased when they call him their God. In fact, he has prepared a city for them.

17 Abraham had faith. So he offered Isaac as a sacrifice. That happened when God put him to the test. Abraham had received the promises. But he was about to offer his one and only son.

18 God had said to him, "Your family line will continue through Isaac."(Genesis 21:12) Even so, Abraham was going to offer him up.

19 Abraham believed that God could raise the dead. In a way, he did receive Isaac back from death.

20 Isaac had faith. So he blessed Jacob and Esau. He told them what was ahead for them.