Genesis 21:12

Then the LORD said unto Abraham, "Let it not be grievous unto thee, because of the lad and of thy bondmaid: But in all that Sara hath said unto thee, hear her voice, for in Isaac shall thy seed be called.

Hebrews 11:18

Of whom it was said, "In Isaac shall thy seed be called."

Genesis 17:19

Then said God, "Nay. Sara thy wife shall bear thee a son, and thou shalt call his name Isaac. And I will make my covenant with him, that it shall be an everlasting covenant unto his seed after him.

Genesis 17:21

But my covenant will I make with Isaac, which Sara shall bear unto thee: even this time, twelve month."

1 Samuel 8:7

And the LORD said unto Samuel, "Hear the voice of the people in all that they say unto thee. For they have not cast thee away, but me: that I should not reign over them.

1 Samuel 8:9

Now therefore hearken unto their voice: howbeit yet, testify unto them and show them the duty of the king that shall reign over them."

Isaiah 46:10

In the beginning of a thing, I show the end thereof: and I tell before, things that are not yet come to pass. With one word is my device accomplished, and fulfilleth all my pleasure.

Romans 9:7-8

Neither are they all children straightway because they are the seed of Abraham: But in Isaac shall thy seed be called,

Treasury of Scripture Knowledge

Summary

And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.

General references

Bible References

Hearken

1 Samuel 8:7
And the LORD said unto Samuel, "Hear the voice of the people in all that they say unto thee. For they have not cast thee away, but me: that I should not reign over them.
Isaiah 46:10
In the beginning of a thing, I show the end thereof: and I tell before, things that are not yet come to pass. With one word is my device accomplished, and fulfilleth all my pleasure.

In isaac

Genesis 17:19
Then said God, "Nay. Sara thy wife shall bear thee a son, and thou shalt call his name Isaac. And I will make my covenant with him, that it shall be an everlasting covenant unto his seed after him.
Romans 9:7
Neither are they all children straightway because they are the seed of Abraham: But in Isaac shall thy seed be called,
Hebrews 11:18
Of whom it was said, "In Isaac shall thy seed be called."

General references

Genesis 21:3
And Abraham called his son's name that was born unto him, which Sara bare him, Isaac:
Genesis 25:5
But Abraham gave all that he had unto Isaac.