21. The Lord said to Moses, ‘When you return to Egypt, see that you perform before Pharaoh all the wonders I have given you the power to do. But I will harden his heart so that he will not let the people go.
22. Then say to Pharaoh, “This is what the Lord says: Israel is my firstborn son,
23. and I told you, ‘Let my son go, so that he may worship me.’ But you refused to let him go; so I will kill your firstborn son.” ’
24. At a lodging place on the way, the Lord met Moses and was about to kill him.
25. But Zipporah took a flint knife, cut off her son’s foreskin and touched Moses’ feet with it. ‘Surely you are a bridegroom of blood to me,’ she said.
26. So the Lord let him alone. (At that time she said ‘bridegroom of blood’, referring to circumcision.)