Numbers 10:21

And the Kohathites set forward, bearing the sanctuary: and {the other} did set up the tabernacle against they came. {the other: that is, the Gershonites and the Merarites}

Numbers 10:17

And the tabernacle was taken down; and the sons of Gershon and the sons of Merari set forward, bearing the tabernacle.

1 Chronicles 23:3

Now the Levites were numbered from the age of thirty years and upward: and their number by their polls, man by man, was thirty and eight thousand.

Numbers 4:3

From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.

Ezra 3:8

Now in the second year of their coming unto the house of God at Jerusalem, in the second month, began Zerubbabel the son of Shealtiel, and Jeshua the son of Jozadak, and the remnant of their brethren the priests and the Levites, and all they that were come out of the captivity unto Jerusalem; and appointed the Levites, from twenty years old and upward, to set forward the work of the house of the LORD.

Numbers 8:24

This {is it} that {belongeth} unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation: {to...: Heb. to war the warfare of, etc}

1 Chronicles 23:27

For by the last words of David the Levites {were} numbered from twenty years old and above: {numbered: Heb. number}

Numbers 1:22

Of the children of Simeon, by their generations, after their families, by the house of their fathers, those that were numbered of them, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;