2 Chronicles 31:16
without regard to genealogical enrollment, to every male 30 years old and older that is, to everyone who entered the LORD's Temple as their duty obligations required for their work and duties according to their divisions
Ezra 3:4
They also observed the Festival of Tents as has been prescribed, offering a specific number of daily burnt offerings in accordance with the ordinance of each day.
Leviticus 21:22-23
However, he may eat the food of his God, including the most holy and the holy offerings,
1 Chronicles 23:3
descendants of Levi 30 years old and above were counted for a total of 38,000.