Exodus 4 25
However, Zipporah used a flint knife to cut off her son's foreskin. She touched his feet with it, and said to him, “You are a blood-husband to me.”
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AMP Exodus 4:25[Now apparently he had failed to circumcise one of his sons, his wife being opposed to it; but seeing his life in such danger] Zipporah took a flint knife and cut off the foreskin of her son and cast it to touch [Moses'] feet, and said, Surely a husband of blood you are to me!
EAS Exodus 4:25But Zipporah took a sharp stone and she cut off her son's foreskin with the stone. She touched Moses' feet with the foreskin. She said, ‘You are a husband of blood to me.’
YLT Exodus 4:25and Zipporah taketh a flint, and cutteth off the foreskin of her son, and causeth it to touch his feet, and saith, 'Surely a bridegroom of blood art thou to me;'