office was to wait, etc.

1 Chronicles 18:17
Benaiah son of Jehoiada was over the Kerethites and Pelethites; and David's sons were chief officials at the king's side.

Nehemiah 11:24
Pethahiah son of Meshezabel, a descendant of Zerah son of Judah, was the king's agent in every matter concerning the people.

for the service

1 Chronicles 23:4
"Of these, " said David, "24, 000 are to oversee the work of the house of the LORD, 6, 000 are to be officers and judges,

1 Chronicles 28:13
for the divisions of the priests and the Levites, for all the work of service in the house of the LORD, and for all the articles of service in the house of the LORD:

Numbers 3:6-9
"Bring the tribe of Levi and present them to Aaron the priest to assist him. . . .

1 Kings 6:5
Against the walls of the temple and the inner sanctuary, Solomon built a chambered structure all around the temple, in which he constructed the side rooms.

2 Chronicles 31:11
Then Hezekiah commanded them to prepare storerooms in the house of the LORD, and they did so.

Ezra 8:29
Guard them carefully until you weigh them out in the chambers of the house of the LORD in Jerusalem before the leading priests, Levites, and heads of the Israelite families."

Nehemiah 13:4, 5, 9
Now before this, Eliashib the priest, a relative of Tobiah, had been put in charge of the storerooms of the house of our God . . .

Jeremiah 35:4
and I brought them into the temple of the LORD, to a chamber occupied by the sons of Hanan son of Igdaliah, a man of God. This room was near the chamber of the officials, which was above the chamber of Maaseiah son of Shallum the doorkeeper.

Ezekiel 41:6-11, 26
The side rooms were arranged one above another in three levels of thirty rooms each. There were ledges all around the wall of the temple to serve as supports for the side rooms, so that the supports would not be fastened into the wall of the temple itself. . . .

Ezekiel 42:3, 13
Gallery faced gallery in three levels, opposite the twenty cubits that belonged to the inner court and opposite the pavement that belonged to the outer court. . . .

purifying

1 Chronicles 9:28, 29
Some of them were in charge of the articles used in worship, to count them whenever they were brought in or taken out. . . .

2 Chronicles 29:5, 18, 19
"Listen to me, O Levites, " He said. "Consecrate yourselves now and consecrate the house of the LORD, the God of your fathers. Remove from the Holy Place every impurity. . . .

2 Chronicles 35:3-6, 11-14
To the Levites who taught all Israel and were holy to the LORD, Josiah said: "Put the holy ark in the temple built by Solomon son of David king of Israel. It is not to be carried around on your shoulders. Now serve the LORD your God and His people Israel. . . .