Exodus 4:21-26
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 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 own 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.)
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