Tertullian

“ And let us not annul this power which God has, which reforms the law’s precepts answerably to the circumstances of the times, with a view to man’s salvation. In fine, let him who contends that the Sabbath is still to be observed as a balm of salvation, and circumcision on the eighth day because of the threat of death, teach us that, for the time past, righteous men kept the Sabbath, or practised circumcision, and were thus rendered “friends of God.” For if circumcision purges a man since God made Adam uncircumcised, why did He not circumcise him, even after his sinning, if circumcision purges? ”

“ For in this law given to Adam we recognise in embryo [4] all the precepts which afterwards sprouted forth when given through Moses; that is, Thou shalt love the Lord thy God from thy whole heart and out of thy whole soul; Thou shalt love thy neighbour as thyself; [5] Thou shalt not kill; Thou shalt not commit adultery; Thou shalt not steal; False witness thou shalt not utter; Honour thy father and mother; and, That which is another’s, shalt thou not covet. For the primordial law was given to Adam and Eve in paradise, as the womb of all the precepts of God. ”

“ In short, if they had loved the Lord their God, they would not have contravened His precept; if they had habitually loved their neighbour—that is, themselves [6] —they would not have believed the persuasion of the serpent, and thus would not have committed murder upon themselves, [7] by falling [8] from immortality, by contravening God’s precept ”