Ezra 6:18
Furthermore, they established the priests in their divisions and the descendants of Levi in their positions for the service of God conducted at Jerusalem, as is proscribed in the Book of Moses.
Numbers 3:6
"Bring the tribe of Levi near and present them to Aaron the priest so they may serve him.
1 Chronicles 24:1
With respect to the descendants of Aaron, classes of service were organized for Nadab, Abihu, Eleazar, and Ithamar, the descendants of Aaron.
2 Chronicles 35:4-5
"Put the holy ark in the Temple that Solomon, the son of Israel's King David, built. It will no longer be a burden on their shoulders. Now go serve the LORD your God and his people Israel. Prepare yourselves by divisions according to your ancestral households, keeping to what King David of Israel and his son Solomon wrote about this.
Numbers 8:9-26
Assemble the descendants of Levi in front of the appointed place of meeting, and assemble the whole congregation of Israel, too.
1 Chronicles 23:1-26
After David had reached old age, and had completed his reign, he set his son Solomon as king over Israel.