Genesis 25:19

Now these are the records of the descendants of Isaac, Abraham’s son: Abraham was the father of Isaac.

Matthew 1:2

Abraham was the father of Isaac, Isaac the father of Jacob, and Jacob the father of Judah and his brothers [who became the twelve tribes of Israel].

1 Chronicles 1:32

Now the sons of Keturah, Abraham’s concubine: she gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan: Sheba and Dedan.

Luke 3:34

the son of Jacob, the son of Isaac, the son of Abraham, the son of Terah, the son of Nahor,

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.

Treasury of Scripture Knowledge

Summary

And these are the generations of Isaac, Abraham's son: Abraham begat Isaac:

Bible References

Abraham

1 Chronicles 1:32
Now the sons of Keturah, Abraham’s concubine: she gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan: Sheba and Dedan.
Matthew 1:2
Abraham was the father of Isaac, Isaac the father of Jacob, and Jacob the father of Judah and his brothers [who became the twelve tribes of Israel].
Luke 3:34
the son of Jacob, the son of Isaac, the son of Abraham, the son of Terah, the son of Nahor,
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.