And ye shall observe this thing for an ordinance to thee and to thy sons for ever.
Exodus 12:14
And this day shall be unto you for a memorial; and ye shall keep it a feast to the LORD throughout your generations; ye shall keep it a feast by an ordinance for ever.
Genesis 17:8-10
8
And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.
9
And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.
10
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.