And on the eighth day the flesh of his foreskin shall be circumcised.
Leviticus 12:3
Surrounding context
12:2 "Speak to the children of Israel, saying: "If a woman has conceived, and borne a male child, then she shall be unclean seven days; as in the days of her customary impurity she shall be unclean.
12:3 And on the eighth day the flesh of his foreskin shall be circumcised.
12:4 She shall then continue in the blood of her purification thirty-three days. She shall not touch any hallowed thing, nor come into the sanctuary until the days of her purification are fulfilled.