TSK · Genesis 21:4

This [is] my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.

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.

What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.

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.›