Numbers 4:38

Those who were numbered of them by their families were two thousand seven hundred fifty.

These are those who were numbered of the families of the Kohathites, all who served in the Tent of Meeting, whom Moses and Aaron numbered according to the commandment of Yahweh by Moses.

from thirty years old and upward even to fifty years old, everyone who entered into the service, for work in the Tent of Meeting,

even those who were numbered of them, by their families, by their fathers' houses, were two thousand six hundred thirty.