Treasury of Scripture Knowledge

Summary

Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.

Bible References

Sara

Luke 1:36
Look, there is your kinswoman Elizabeth! Even she has conceived a son in her old age, and she who was called barren is now in her sixth month;
1 Peter 3:5
It was in this way long ago that the holy women who hoped in God adorned themselves. They were submissive to their husbands.

Because

Hebrews 10:23
let us hold the hope we avow without wavering (for we can rely on him who gave us the Promise);
Romans 4:20
no unbelief made him waver about God's promise; his faith won strength as he gave glory to God