Circumcision is supremely important to God. It is his "everlasting covenant."
I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee. Genesis 17:7Every boy must be circumcised when he is eight days old.
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 ye shall circumcise the flesh of your foreskin. v Genesis 17:10-11
My covenant shall be in your flesh for an everlasting covenant. Genesis 17:13
And I will establish my covenant with him for an everlasting covenant, and with his seed after him. Genesis 17:19
He that is eight days old shall be circumcised among you, every man child in your generations. Genesis 17:12All of your male slaves must also be circumcised.
He that is bought with thy money, must needs be circumcised. Genesis 17:13Jesus was circumcised eight days after his birth.
When eight days were accomplished for the circumcising of the child, his name was called JESUS. Luke 2:21(But Paul disagreed with God on this. See Is circumcision necessary?)