Gen 18:10, 14, 21:1-2, Rom 9:7-8, Heb 11:11 | ISV

Genesis 18:10

Genesis 18:14

Genesis 21:1-2

Romans 9:7-8

7 and not all of Abraham's descendants are his true descendants. On the contrary, “It is through Isaac that descendants will be named for you.” ^{▼▼Gen 21:12}Gen 21:12; Gal 4:23; Heb 11:18 8 That is, it is not the children of natural descent who are God's children, but it is the children of the promise who are regarded as descendants.Gal 4:28

Hebrews 11:11

11 By faith Sarah, even though she was old and barren, received the strength to conceive, because she was convinced that the one who had made the promise was faithful.Gen 17:19; 21:2; Luke 1:36; Rom 4:21; Heb 10:23