Numbers 31:10 (KJV)

So there were delivered out of the thousands of Israel, a thousand of every tribe, twelve thousand armed for war.

And Moses sent them to the war, a thousand of every tribe, them and Phinehas the son of Eleazar the priest, to the war, with the holy instruments, and the trumpets to blow in his hand.

And they warred against the Midianites, as the LORD commanded Moses; and they slew all the males.

And they slew the kings of Midian, beside the rest of them that were slain; namely, Evi, and Rekem, and Zur, and Hur, and Reba, five kings of Midian: Balaam also the son of Beor they slew with the sword.

And the children of Israel took all the women of Midian captives, and their little ones, and took the spoil of all their cattle, and all their flocks, and all their goods.

And they took all the spoil, and all the prey, both of men and of beasts.

And they brought the captives, and the prey, and the spoil, unto Moses, and Eleazar the priest, and unto the congregation of the children of Israel, unto the camp at the plains of Moab, which are by Jordan near Jericho.

And Moses, and Eleazar the priest, and all the princes of the congregation, went forth to meet them without the camp.

And Moses was wroth with the officers of the host, with the captains over thousands, and captains over hundreds, which came from the battle.

And Moses said unto them, Have ye saved all the women alive?