Book of Adam and Eve

Adam replied and said to Eve, "You will not be able to add (anything to it). On the contrary, hold to the number of days which I will tell you and keep it. And I will do penitence for forty days, and you, do penitence for thirty-four days. Leave me these six days, since were you not created upon the sixth day, when God completed the creation of all creatures? Now, You arise and go to the river Tigris; and put a stone under your feet and stay in the water and clothe yourself (with it) up to your neck. While you pray, (beware) let no sound come from your mouth, for we are not worthy to open our mouths, for our lips are impure because we transgressed the commandments, concerning the food [so as to eat from the tree] of paradise which God had forbidden us.