2 Kings 11:6

and a third part shall be at the gate of Sur; and a third part at the gate behind the couriers; and ye shall keep the watch of the house for a defence.

1 Chronicles 26:13-19

And they cast lots, the small as well as the great, according to their fathers' houses, for every gate.

2 Chronicles 23:4-5

This is the thing which ye shall do: a third part of you that come in on the sabbath, of the priests and of the Levites, shall be keepers of the doors;

Treasury of Scripture Knowledge

Summary

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.

Bible References

The gate of sur

1 Chronicles 26:13
And they cast lots, the small as well as the great, according to their fathers' houses, for every gate.
2 Chronicles 23:4
This is the thing which ye shall do: a third part of you that come in on the sabbath, of the priests and of the Levites, shall be keepers of the doors;