Numbers 8:24

“But the Levites shall camp around the tabernacle of the testimony so that there will be no wrath on the congregation of the sons of Israel. So the Levites shall keep charge of the tabernacle of the testimony.”

from thirty years and upward, even to fifty years old, all who enter the duty of doing the work in the tent of meeting.

from thirty years and upward even to fifty years old, you shall number them, everyone who enters the duty of performing the service of the tent of meeting.

from thirty years and upward even to fifty years old, everyone who entered the duty of service in the tent of meeting,