Romans 9:9

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

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.”

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 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.

Hebrews 11:11-12

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].

Hebrews 11:17

By faith Abraham, when he was tested [that is, as the testing of his faith was still in progress], offered up Isaac, and he who had received the promises [of God] was ready to sacrifice his only son [of promise];

Treasury of Scripture Knowledge

Summary

For this is the word of promise, At this time will I come, and Sara shall have a son.

General references

Bible References

At this time

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 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.
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].

General references

Genesis 25:5
Now Abraham gave everything that he had to Isaac;
Galatians 4:28
And we, [believing] brothers and sisters, like Isaac, are children [not merely of physical descent, like Ishmael, but are children born] of promise [born miraculously].