6 a third at the Sur Gate, and a third at the gate behind the guard, who take turns guarding the temple—

Read 2 Kings 11:6 Using Other Translations

And a third part shall be at the gate of Sur; and a third part at the gate behind the guard: so shall ye keep the watch of the house, that it be not broken down.
(another third being at the gate Sur and a third at the gate behind the guards) shall guard the palace.
Another third of you are to stand guard at the Sur Gate. And the final third must stand guard behind the palace guard. These three groups will all guard the palace.