Knives

At that time the LORD said to Joshua, “Make flint knives and circumcise the sons of Israel once again.”

So Joshua made flint knives and circumcised the sons of Israel at Gibeath-haaraloth.

So they shouted louder and cut themselves with knives and lances, as was their custom, until the blood gushed over them.

…there is a generation whose teeth are swords and whose jaws are knives, devouring the oppressed from the earth and the needy from among men.