2 Chronicles 23:2-4

Darby Translation

² And they went about in Judah and gathered together the Levites out of all the cities of Judah, and the chief fathers of Israel; and they came to Jerusalem.

³ And all the congregation made a covenant with the king in the house of God. And he said to them, Behold, the king's son shall reign, as Jehovah has said of the sons of David.

⁴ This is the thing which ye shall do: a third part of you that come in on the sabbath, of the priests and of the Levites, shall be keepers of the doors;