2 Chronicles 23:3-7
3-7The priest Jehoiada showed them the young prince and addressed them: "Here he is—the son of the king. He is going to rule just as God promised regarding the sons of David. Now this is what you must do: A third of you priests and Levites who come on duty on the Sabbath are to be posted as security guards at the gates; another third will guard the palace; and the other third will guard the foundation gate. All the people will gather in the courtyards of The Temple of God. No one may enter The Temple of God except the priests and designated Levites—they are permitted in because they've been consecrated, but all the people must do the work assigned them. The Levites are to form a ring around the young king, weapons at the ready. Kill anyone who tries to break through your ranks. Your job is to stay with the king at all times and places, coming and going."
8-10All the Levites and officers obeyed the orders of Jehoiada the priest. Each took charge of his men, both those who came on duty on the Sabbath and those who went off duty on the Sabbath, for Jehoiada the priest hadn't exempted any of them from duty. Then the priest armed the officers with spears and the large and small shields originally belonging to King David that were stored in The Temple of God. Well-armed, the guards took up their assigned positions for protecting the king, from one end of The Temple to the other, surrounding both Altar and Temple.