Genesis 17:12,13
And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of your seed.
Nave's Topical Index—AKJV

Leviticus 12:3
And in the eighth day the flesh of his foreskin shall be circumcised.
Nave's Topical Index—AKJV

Philippians 3:5
Circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, an Hebrew of the Hebrews; as touching the law, a Pharisee;
Nave's Topical Index—AKJV