Exodus 4:24-26

As Moses was on his way to Egypt, he stopped at a resting place for the night. The LORD met him there and tried to kill him. But Zipporah took a flint knife and circumcised her son. Taking the skin, she touched Moses’ feet with it and said to him, “You are a bridegroom of blood to me.” She said, “You are a bridegroom of blood,” because she had to circumcise her son. So the LORD let Moses alone.