2 Kings 11:6

A third part shall be at the gate Sur; and a third part at the gate behind the guard. So you shall keep the watch of the house, and be a barrier.

1 Chronicles 26:13-19

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 that you shall do. A third part of you, who come in on the Sabbath, of the priests and of the Levites, shall be porters of the thresholds.

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
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 that you shall do. A third part of you, who come in on the Sabbath, of the priests and of the Levites, shall be porters of the thresholds.