Exodus 4:25
Zipporah took a flint knife, cut off her son's foreskin, and touched Moses' feet with it, saying while doing so, ""because you are a bridegroom of blood to me."
Joshua 5:2-3
At that time the LORD told Joshua, "Make for yourselves some flint knives and circumcise the Israelis who haven't been circumcised yet."
Genesis 17:14
Any uncircumcised male who does not have the foreskin of his flesh circumcised on the eighth day after his birth is to be eliminated from his people because he has broken my covenant."
2 Samuel 16:7
"Get out of here! Get out!" Shimei yelled as he cursed. "You murderer! You who think you're above the law!