Deuteronomy 20:17

“So now, kill every male among the little ones, and kill every woman who has known man intimately.

“When Yahweh your God brings you into the land where you are entering to possess it, and He clears away many nations before you, the Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites, seven nations more numerous and stronger than you,

“And the city shall be devoted to destruction, it and all that is in it belongs to Yahweh; only Rahab the harlot and all who are with her in the house shall live because she hid the messengers whom we sent.

But they burned the city with fire, and all that was in it. Only the silver and gold, and articles of bronze and iron, they put into the treasury of the house of Yahweh.

“Then it will be that when you have seized the city, that you shall set the city on fire. You shall do it according to the word of Yahweh. See, I have commanded you.”

So all who fell that day, both men and women, were 12,000—all the people of Ai.

And Joshua captured all the cities of these kings and all their kings, and he struck them with the edge of the sword, and he devoted them to destruction, just as Moses the servant of Yahweh had commanded.

‘Now go and strike Amalek and devote to destruction all that he has, and do not spare him; but put to death both man and woman, infant and nursing baby, ox and sheep, camel and donkey.’”