TSK · Genesis 17:12

And Abraham circumcised his son Isaac being eight days old, as God had commanded him.

And when a stranger shall sojourn with thee, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.

And it came to pass, that on the eighth day they came to circumcise the child; and they called him Zacharias, after the name of his father.

‹Moses therefore gave unto you circumcision; (not because it is of Moses, but of the fathers;) and ye on the sabbath day circumcise a man.›

For he is not a Jew, which is one outwardly; neither [is that] circumcision, which is outward in the flesh: