Genesis 17:12

Then Abraham circumcised his son Isaac when he was eight days old, as God had commanded him.

but every man’s slave purchased with money, after you have circumcised him, then he may eat of it.

“And you shall do the same with your oxen and with your sheep. It shall be with its mother seven days; on the eighth day you shall give it to Me.

‘Now on the eighth day the flesh of his foreskin shall be circumcised.

And it happened that on the eighth day they came to circumcise the child, and they were going to call him Zechariah, after the name of his father.

And when eight days were fulfilled so that they could circumcise Him, His name was called Jesus, the name given by the angel before He was conceived in the womb.

“For this reason Moses has given you circumcision (not because it is from Moses, but from the fathers), and on the Sabbath you circumcise a man.

“And He gave him the covenant of circumcision; and so Abraham was the father of Isaac, and circumcised him on the eighth day; and Isaac was the father of Jacob, and Jacob of the twelve patriarchs.