Exodus 4:24, 25, 26

On the way to Egypt, Moses stopped for the night. There the LORD met him and was about to kill him.

But Zipporah got a knife made out of flint. She circumcised her son with it. Then she touched Moses’ feet with the skin she had cut off. “Surely, you are a husband who has forced me to spill my son’s blood,” she said.

So the LORD didn’t kill Moses. When she said “husband who has forced me to spill my son’s blood,” she was talking about circumcision.