11 By faith even Sarah herself received power for conception of seed, and she gave birth beyond the time of age, because she considered him faithful who promised.
Hebrews 11:11 Cross References - ACV
Genesis 17:17-19
17 Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born to him who is a hundred years old? And shall Sarah, who is ninety years old, bear?
18 And Abraham said to God, Oh that Ishmael might live before thee!
19 And God said, No, but Sarah thy wife shall bear thee a son, and thou shall call his name Isaac. And I will establish my covenant with him for an everlasting covenant for his seed after him.
Genesis 18:11-14
11 Now Abraham and Sarah were old, and well stricken in age. It had ceased to be with Sarah after the manner of women.
12 And Sarah laughed within herself, saying, After I have become old shall I have pleasure, my lord also being old?
13 And LORD said to Abraham, Why did Sarah laugh, saying, Shall I who am old certainly bear a child?
14 Is anything too hard for LORD? At the set time I will return to thee, when the season comes round, and Sarah shall have a son.
Genesis 21:1-2
Luke 1:36
36 And behold, Elizabeth thy kinswoman, she also has conceived a son in her old age, and this is the sixth month with her who was called barren.
Romans 4:20-21
Hebrews 10:23
23 Let us hold firm the affirmation of the hope unwavering, for he who promised is faithful.