Ezra 3:8
In the second year of their coming to God’s house at Jerusalem, in the second month, Zerubbabel the son of Shealtiel and Jeshua the son of Jozadak began [the work], with the rest of their brothers—the priests and Levites and all who came to Jerusalem from the captivity. They appointed the Levites, from twenty years old and upward, to oversee the work of the house of the Lord.
Numbers 4:3
from thirty years old and upward, even to fifty years old, all who enter the service to do the work in the Tent of Meeting (tabernacle).
1 Chronicles 23:4
Of these
1 Chronicles 23:24-32
These were the Levites by their fathers’ households, the heads of the fathers’ households of those registered, according to the number of names of the individuals who were the servants of the house of the Lord, from twenty years old and upward.
Ezra 4:3
But Zerubbabel and Jeshua and the rest of the heads of fathers’ households of Israel said to them, “You have nothing in common with us in building a house to our God; but we ourselves will together build to the Lord God of Israel, just as King Cyrus, the king of Persia, has commanded us.”