Genesis 25:16

These are the sons of Ishmael, and these are their names, by their towns and by their palaces; twelve princes according to their families.

Genesis 17:20

And as for Ishmael, I have heard thee: Behold, I shall bless him and will make him fruitful and will multiply him exceedingly; he shall beget twelve princes, and I will make him a great nation.

Genesis 17:23

Then Abraham took Ishmael his son and all the servants born in his house and all that were bought with his money, every male among the men of Abraham's house, and circumcised the flesh of their foreskin in that same day as God had said unto him.

Treasury of Scripture Knowledge

Summary

These are the sons of Ishmael, and these are their names, by their towns, and by their castles; twelve princes according to their nations.

Twelve

Bible References

Twelve

Genesis 17:20
And as for Ishmael, I have heard thee: Behold, I shall bless him and will make him fruitful and will multiply him exceedingly; he shall beget twelve princes, and I will make him a great nation.