Genesis 21:2

So Sarah conceived and gave birth to a son for Abraham in his old age, at the appointed time of which God had spoken to him.

Galatians 4:22

For it is written that Abraham had two sons, one by the slave woman [Hagar] and one by the free woman [Sarah].

Hebrews 11:11

By faith even Sarah herself received the ability to conceive [a child], even [when she was long] past the normal age for it, because she considered Him who had given her the promise to be reliable and true [to His word].

Genesis 17:21

But My covenant [My promise, My solemn pledge], I will establish with Isaac, whom Sarah will bear to you at this time next year.”

Genesis 17:19

But God said, “No, Sarah your wife shall bear you a son indeed, and you shall name him Isaac (laughter); and I will establish My covenant with him for an everlasting covenant and with his descendants after him.

Genesis 18:10

He said, “I will surely return to you at this time next year; and behold, Sarah your wife will have a son.” And Sarah was listening at the tent door, which was behind him.

Genesis 18:14

Is anything too difficult or too wonderful for the Lord? At the appointed time, when the season [for her delivery] comes, I will return to you and Sarah will have a son.”

Acts 7:8

And God gave Abraham a covenant [a formal agreement to be strictly observed] of [which] circumcision [was the sign]; and so [under these circumstances] Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac [became the father] of Jacob, and Jacob [became the father] of the twelve patriarchs.

2 Kings 4:16-17

Elisha said, “At this season next year, you will embrace a son.” She said, “No, my lord. O man of God, do not lie to your maidservant.”

Luke 1:24-25

Now after this his wife Elizabeth became pregnant, and for five months she secluded herself completely, saying,

Luke 1:36

And listen, even your relative Elizabeth has also conceived a son in her old age; and she who was called barren is now in her sixth month.

Romans 9:9

For this is what the promise said: “About this time [next year] I will come, and Sarah shall have a son.”

Treasury of Scripture Knowledge

Summary

For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.

General references

Bible References

Conceived

2 Kings 4:16
Elisha said, “At this season next year, you will embrace a son.” She said, “No, my lord. O man of God, do not lie to your maidservant.”
Luke 1:24
Now after this his wife Elizabeth became pregnant, and for five months she secluded herself completely, saying,
Acts 7:8
And God gave Abraham a covenant [a formal agreement to be strictly observed] of [which] circumcision [was the sign]; and so [under these circumstances] Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac [became the father] of Jacob, and Jacob [became the father] of the twelve patriarchs.
Galatians 4:22
For it is written that Abraham had two sons, one by the slave woman [Hagar] and one by the free woman [Sarah].
Hebrews 11:11
By faith even Sarah herself received the ability to conceive [a child], even [when she was long] past the normal age for it, because she considered Him who had given her the promise to be reliable and true [to His word].

At the set

Genesis 17:19
But God said, “No, Sarah your wife shall bear you a son indeed, and you shall name him Isaac (laughter); and I will establish My covenant with him for an everlasting covenant and with his descendants after him.
Genesis 18:10
He said, “I will surely return to you at this time next year; and behold, Sarah your wife will have a son.” And Sarah was listening at the tent door, which was behind him.
Romans 9:9
For this is what the promise said: “About this time [next year] I will come, and Sarah shall have a son.”

General references

Luke 1:57
Now the time had come for Elizabeth to give birth, and she gave birth to a son.
Hebrews 6:15
And so, having patiently waited, he realized the promise [in the miraculous birth of Isaac, as a pledge of what was to come from God].