Numbers 31:4-6

Young's Literal Translation

⁴ a thousand for a tribe -- a thousand for a tribe, to all the tribes of Israel -- ye do send to the host.'

⁵ And there are given out of the thousands of Israel a thousand for a tribe, twelve thousand armed ones of the host;

⁶ and Moses sendeth them, a thousand for a tribe, to the host, them and Phinehas son of Eleazar the priest, to the host; and the holy vessels, and the trumpets of the shouting, in his hand.