1 Chronicles 26:13-19

And the families were taken by the decision of the Lord for every door; the small family had the same chance as the great.

2 Chronicles 23:4-5

This is what you are to do: let a third of you, of the priests and Levites, who come in on the Sabbath, keep 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 the families were taken by the decision of the Lord for every door; the small family had the same chance as the great.
2 Chronicles 23:4
This is what you are to do: let a third of you, of the priests and Levites, who come in on the Sabbath, keep the doors

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain