What does 2 Chronicles 23:7 mean?

The Levites must stay close to the king, each with their weapons, ready to defend him. Anyone who tries to get in should be killed. Stay with the king wherever he goes.' 2 Chronicles 23:7 - Modern Text Bible

(The Levites are told to protect Joash at all costs, even if it means using force. Their job is to keep him safe during the transition.)