6 No one is to enter the temple of the LORD except the priests and Levites on duty; they may enter because they are consecrated, but all the others are to observe the LORD’s command not to enter.a

Read 2 Chronicles 23:6 Using Other Translations

But let none come into the house of the LORD, save the priests, and they that minister of the Levites; they shall go in, for they are holy: but all the people shall keep the watch of the LORD.
Let no one enter the house of the LORD except the priests and ministering Levites. They may enter, for they are holy, but all the people shall keep the charge of the LORD.
Remember, only the priests and Levites on duty may enter the Temple of the LORD, for they are set apart as holy. The rest of the people must obey the LORD ’s instructions and stay outside.