Exodus 4:24, 25, 26

And it came to pass on the way, at the encampment, that the LORD met him and sought to kill him.

Then Zipporah took a sharp stone and cut off the foreskin of her son and cast it at Moses’ feet, and said, “Surely you are a husband of blood to me!”

So He let him go. Then she said, “You are a husband of blood!”—because of the circumcision.