Genesis 19:31

19:31 Later the older daughter said to the younger, “Our father is old, and there is no man anywhere nearby to have sexual relations with us, according to the way of all the world.

Genesis 19:35

19:35 So they made their father drunk that night as well, and the younger one came and had sexual relations with him. But he was not aware that she had sexual relations with him and then got up.

Genesis 19:38

19:38 The younger daughter also gave birth to a son and named him Ben-Ammi. He is the ancestor of the Ammonites of today.

Genesis 25:23

25:23 and the Lord said to her,

“Two nations are in your womb,

and two peoples will be separated from within you.

One people will be stronger than the other,

and the older will serve the younger.”