A third part of you shall be porters of the doors Or rather, guards at the gates, to prevent any of Athaliah's party from entering into the temple. At the gate of the foundation So called, because it stood lower than the rest of the doors, at the foot of the steps by which they went up from the king's house to the temple. And all the people shall be in the courts In the two courts; for by the people here he seems to intend both the generality of the Levites, who had no particular station assigned them, such as their brethren had, and who were to be in the court of the priests, and the people who were in the court of the people.
Related Commentaries of 2 Chronicles 23:4
2 Chronicles 23:4-5
4 This is the thing that ye shall do; A third part of you entering on the sabbath, of the priests and of the Levites, shall be porters of the doors;a
5 And a third part shall be at the king's house; and a third part at the gate of the foundation: and all the people shall be in the courts of the house of the LORD.