Numbers 31:4-6

Amplified Bible, Classic Edition

⁴ From each of the tribes of Israel you shall send 1,000 to the war.

⁵ So there were provided out of the thousands of Israel 1,000 from each tribe, 12,000 armed for war.

⁶ And Moses sent them to the war, 1,000 from each tribe, together with Phinehas son of Eleazar, the priest, with the [sacred] vessels of the sanctuary and the trumpets to blow the alarm in his hand.