The Levites: Guarded King's Person and House in Times of Danger
Source: TTT
2 Kings 11:5–9
and commanded them, “This is what you are to do: A third of you who come on duty on the Sabbath shall guard the royal palace, / a third shall be at the gate of Sur, and a third at the gate behind the guards. You are to take turns guarding the temple— / the two divisions that would go off duty on the Sabbath are to guard the house of the LORD for the king.
2 Chronicles 23:5–7
a third shall be at the royal palace, and a third at the Foundation Gate, while all the others are in the courtyards of the house of the LORD. / No one is to enter the house of the LORD except the priests and those Levites who serve; they may enter because they are consecrated, but all the people are to obey the requirement of the LORD. / The Levites must surround the king with weapons in hand, and anyone who enters the temple must be put to death. You must stay close to the king wherever he goes.”