Hebrews 11:11

By faith even Sarah herself received power to conceive seed when she was past age, since she counted him faithful who had promised:

Genesis 18:11-14

Now Abraham and Sarah were old, and well stricken in age; it had ceased to be with Sarah after the manner of women.

Hebrews 10:23

let us hold fast the confession of our hope that it waver not; for he is faithful that promised:

Genesis 17:17-19

Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is a hundred years old? and shall Sarah, that is ninety years old, bear?

Genesis 21:1-2

And Jehovah visited Sarah as he had said, and Jehovah did unto Sarah as he had spoken.

Luke 1:36

And behold, Elisabeth thy kinswoman, she also hath conceived a son in her old age; and this is the sixth month with her that was called barren.

Romans 4:20-21

yet, looking unto the promise of God, he wavered not through unbelief, but waxed strong through faith, giving glory to God,

1 Peter 3:5-6

For after this manner aforetime the holy women also, who hoped in God, adorned themselves, being in subjection to their own husbands:

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.

General references

Bible References

Sara

Genesis 17:17
Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is a hundred years old? and shall Sarah, that is ninety years old, bear?
Genesis 18:11
Now Abraham and Sarah were old, and well stricken in age; it had ceased to be with Sarah after the manner of women.
Genesis 21:1
And Jehovah visited Sarah as he had said, and Jehovah did unto Sarah as he had spoken.
Luke 1:36
And behold, Elisabeth thy kinswoman, she also hath conceived a son in her old age; and this is the sixth month with her that was called barren.
1 Peter 3:5
For after this manner aforetime the holy women also, who hoped in God, adorned themselves, being in subjection to their own husbands:

Because

Hebrews 10:23
let us hold fast the confession of our hope that it waver not; for he is faithful that promised:
Romans 4:20
yet, looking unto the promise of God, he wavered not through unbelief, but waxed strong through faith, giving glory to God,

General references

2 Kings 4:17
And the woman conceived, and bare a son at that season, when the time came round, as Elisha had said unto her.

American Standard Version Public Domain