Genesis 21:4 Then Abraham circumcised his son Isaac when he was eight days old, as God had commanded him. (NASB ©1995)Genesis 17:12 "And every male among you who is eight days old shall be circumcised throughout your generations, a servant who is born in the house or who is bought with money from any foreigner, who is not of your descendants.
Acts 7:8 "And He gave him the covenant of circumcision; and so Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac became the father of Jacob, and Jacob of the twelve patriarchs. (NASB ©1995) Treasury of Scripture Knowledge And Abraham circumcised his son Isaac being eight days old, as God had commanded him.17:10-12 Ex 12:48 Le 12:3 De 12:32 Lu 1:6,59 2:21 Joh 7:22,23 Ac 7:8 Concordance Entries Circumcised Circumciseth Circumcision Commanded Eight Isaac Undergo Jump to Previous Occurrence Abraham Circumcised Circumciseth Circumcision Commanded Eight Isaac Undergo Jump to Next Occurrence Abraham Circumcised Circumciseth Circumcision Commanded Eight Isaac Undergo New American Standard Bible Copyright © 1960, 1962, 1963, 1968, 1971, 1972, 1973, 1975, 1977, 1995 by The Lockman Foundation, La Habra, Calif. All rights reserved. For Permission to Quote Information visit http://www.lockman.org. | 
