Numbers 8:24

8:24 “This is what pertains to the Levites: At the age of twenty-five years and upward one may begin to join the company in the work of the tent of meeting,

Numbers 10:25

10:25 The standard of the camp of the Danites set out, which was the rear guard of all the camps by their companies; over his company was Ahiezer son of Ammishaddai.