Numbers 4:35

4:35 from thirty years old and upward to fifty years old, everyone who entered the company for the work in the tent of meeting;

Numbers 4:39

4:39 from thirty years old and upward to fifty years old, everyone who entered the company for the work in the tent of meeting –

Numbers 4:43

4:43 from thirty years old and upward to fifty years old, everyone who entered the company for the work in the tent of meeting –

Numbers 8:25

8:25 and at the age of fifty years they must retire from performing the work and may no longer work.