Circumcision: Performed on all Males on the Eighth Day
Source: Nav
Genesis 17:12, 13
Generation after generation, every male must be circumcised when he is eight days old, including those born in your household and those purchased from a foreigner—even those who are not your offspring. / Whether they are born in your household or purchased, they must be circumcised. My covenant in your flesh will be an everlasting covenant.
Leviticus 12:3
And on the eighth day the flesh of the boy’s foreskin is to be circumcised.
Philippians 3:5
circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin; a Hebrew of Hebrews; as to the law, a Pharisee;