Numbers 31:6

⁴  Of every tribe a thousand, throughout all the tribes of Israel, shall ye send to the war.

⁵  So there were delivered out of the thousands of Israel, a thousand of every tribe, twelve thousand armed for war.

⁶  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.

⁷  And they warred against the Midianites, as the LORD commanded Moses; and they slew all the males.

⁸  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.