2 Kings 11:6

and the third is at the gate of Sur, and the third at the gate behind the runners, and ye have kept the charge of the house pulled down;

1 Chronicles 26:13-19

and they cause to fall lots, as well the small as the great, according to the house of their fathers, for gate and gate.

2 Chronicles 23:4-5

This is the thing that ye do: The third of you, going in on the sabbath, of the priests, and of the Levites, are for gatekeepers 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
and they cause to fall lots, as well the small as the great, according to the house of their fathers, for gate and gate.
2 Chronicles 23:4
This is the thing that ye do: The third of you, going in on the sabbath, of the priests, and of the Levites, are for gatekeepers of the thresholds,