Genesis 17:25

Revised Standard Version CI

And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin.

Cross References

Genesis 16:16

Abram was eighty-six years old when Hagar bore Ishmael to Abram.

Genesis 17:26

That very day Abraham and his son Ishmael were circumcised;

Genesis 16:15

And Hagar bore Abram a son; and Abram called the name of his son, whom Hagar bore, Ishmael.