2 Chronicles 23:5

2 They went around in Judah and gathered the Levites out of all the cities of Judah, and the heads of fathers’ households of Israel, and they came to Jerusalem.

3 All the assembly made a covenant with the king in God’s house. Jehoiada said to them, “Behold, the king’s son must reign, as the LORD has spoken concerning the sons of David.

4 This is the thing that you must do: a third part of you, who come in on the Sabbath, of the priests and of the Levites, shall be gatekeepers of the thresholds.

5 A third part shall be at the king’s house; and a third part at the gate of the foundation. All the people will be in the courts of the LORD’s house.

6 But let no one come into the LORD’s house except the priests and those who minister of the Levites. They shall come in, for they are holy, but all the people shall follow the LORD’s instructions.

7 The Levites shall surround the king, every man with his weapons in his hand. Whoever comes into the house, let him be slain. Be with the king when he comes in and when he goes out.”

8 So the Levites and all Judah did according to all that Jehoiada the priest commanded. They each took his men, those who were to come in on the Sabbath, with those who were to go out on the Sabbath, for Jehoiada the priest didn’t dismiss the shift.