Exodus 4:20-26

20So Moses put his wife and his sons on a donkey and they started on the journey back to Egypt. And Moses carried the stick of God in his hand.

21Then the Lord said to Moses, ‘When you return to Egypt you must do the signs. Do all the signs that I gave you the power to do. Do them in front of Pharaoh. But I will make Pharaoh angry and cruel. Because of this, he will not let the people go.

22Then you must speak to Pharaoh. You must say, “The Lord says, Israel is my first son.

23I have already said to you, Let my son go so that he can worship me. But if you refuse to let him go, I will kill your first son.” ’

24On the way to Egypt, there was a place where people could rest on their journey. The Lord met Moses there and he wanted to kill Moses.

25But Zipporah took a sharp stone and she cut off her son's foreskin with the stone. She touched Moses' feet with the foreskin. She said, ‘You are a husband of blood to me.’

26So God did not do anything bad to Moses. Then Zipporah said to Moses, ‘You are a husband of blood, because of this circumcision.’