Genesis 17:25

Young's Literal Translation 1862

and Ishmael his son `is' a son of thirteen years in the flesh of his foreskin being circumcised;

Cross References

Genesis 16:15

And Hagar beareth to Abram a son; and Abram calleth the name of his son, whom Hagar hath borne, Ishmael;

Genesis 16:16

and Abram `is' a son of eighty and six years in Hagar's bearing Ishmael to Abram.

Genesis 17:26

in this self-same day hath Abraham been circumcised, and Ishmael his son;