Numbers 4:34-36

Young's Literal Translation

³⁴ And Moses numbereth -- Aaron also, and the princes of the company -- the sons of the Kohathite, by their families, and by the house of their fathers,

³⁵ from a son of thirty years and upward even unto a son of fifty years, every one who is going in to the host, for service in the tent of meeting,

³⁶ and their numbered ones, by their families, are two thousand seven hundred and fifty.