Genesis 17:24-27
Context17:24 Now Abraham was 99 years old 1 when he was circumcised; 2 17:25 his son Ishmael was thirteen years old 3 when he was circumcised. 17:26 Abraham and his son Ishmael were circumcised on the very same day. 17:27 All the men of his household, whether born in his household or bought with money from a foreigner, were circumcised with him.