19 While Moses was still in Midian, the Lord said to him, “Go back to Egypt, for all those who wanted to kill you are dead.”
20 So Moses took his wife and his sons, put them on a donkey, and set out with them for Egypt, carrying the walking stick that God had told him to take.
21 Again the Lord said to Moses, “Now that you are going back to Egypt, be sure to perform before the king all the miracles which I have given you the power to do. But I will make the king stubborn, and he will not let the people go.
22 Then you must tell him that I, the Lord, say, ‘Israel is my first-born son.
23 I told you to let my son go, so that he might worship me, but you refused. Now I am going to kill your first-born son.’”
24 At a camping place on the way to Egypt, the Lord met Moses and tried to kill him.
25-26 Then Zipporah, his wife, took a sharp stone, cut off the foreskin of her son, and touched Moses' feet with it. Because of the rite of circumcision she said to Moses, “You are a husband of blood to me.” And so the Lord spared Moses' life.