Cross reference
Genesis 25:16
16 These are the sons of Ishmael, and these are their names, by their villages, and by their encampments: twelve princes, according to their nations.
Genesis 17:20
20 As for Ishmael, I have heard you. Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly. He will become the father of twelve princes, and I will make him a great nation.
Genesis 17:23
23 Abraham took Ishmael his son, all who were born in his house, and all who were bought with his money; every male among the men of Abraham's house, and circumcised the flesh of their foreskin in the same day, as God had said to him.