^8 (A) God said to Abraham, “Every son in each family must be circumcised to show you have kept your agreement with me.” So when Isaac was eight days old, Abraham circumcised him. Later, Isaac circumcised his son Jacob, and Jacob circumcised his twelve sons.

^11 (A) Abraham let himself be circumcised to show he had been accepted because of his faith even before he was circumcised. This makes Abraham the father of all who are acceptable to God because of their faith, even though they are not circumcised.