And when the LORD your God delivers it into your hands, you shall strike every male in it with the edge of the sword.
Deuteronomy 20:13
Surrounding context
20:12 Now if the city will not make peace with you, but war against you, then you shall besiege it.
20:13 And when the LORD your God delivers it into your hands, you shall strike every male in it with the edge of the sword.
20:14 But the women, the little ones, the livestock, and all that is in the city, all its spoil, you shall plunder for yourself; and you shall eat the enemies' plunder which the LORD your God gives you.