Exodus 4:24, 25-26

At a camping place on the way to Egypt, the LORD met Moses and tried to kill him.

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.