From now on you must circumcise every baby boy when he is eight days old, including slaves born in your homes and slaves bought from foreigners. This will show that there is a covenant between you and me.
The blood on the doorposts will be a sign to mark the houses in which you live. When I see the blood, I will pass over you and will not harm you when I punish the Egyptians.
This observance will be a reminder, like something tied on our hands or on our foreheads; it will remind us that the Lord brought us out of Egypt by his great power.’”