Genesis 17:26

26 That very day Abraham and his son Ish'mael were circumcised;

Genesis 17:26 In-Context

24 Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin.
25 And Ish'mael his son was thirteen years old when he was circumcised in the flesh of his foreskin.
26 That very day Abraham and his son Ish'mael were circumcised;
27 and all the men of his house, those born in the house and those bought with money from a foreigner, were circumcised with him.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.