21 While Moses was traveling back to Egypt, the Lord spoke to him, “When you talk to Pharaoh remember to show him all the miracles that I have given you the power to do. But I will cause Pharaoh to be very stubborn. He will not let the people go.
22 Then you should say to Pharaoh, ‘This is what the Lord says: Israel is my firstborn son.
23 And I am telling you to let my son go and worship me. If you refuse to let Israel go, then I will kill your firstborn son.’”
24 On the way to Egypt, Moses stopped at a place to spend the night. The Lord met Moses at that place and tried to kill him.
25 But Zipporah took a flint knife and circumcised her son. She took the skin and touched his feet. Then she said to Moses, “You are a bridegroom of blood to me.”
26 Zipporah said this because she had to circumcise her son. So God let Moses live.
27 The Lord had spoken to Aaron and told him, “Go out into the desert and meet Moses.” So Aaron went and met Moses at the Mountain of God. He saw Moses and kissed him.