2 Chronicles 23:4

This the word which ye shall do; the third of you coming in the Sabbath to the priests and to the Levites, to the gates of the thresholds;

1 Chronicles 9:25

And their brethren in their enclosures to come for seven days from time to time with these.

1 Chronicles 23:3-6

And the Levites will be numbered from the son of thirty years and above: and their number, for their craniums, for the men, thirty and eight thousand.

1 Chronicles 24:3-6

And David will separate them, and Zadok from the sons of Eleazar, and Ahimelech from the sons, of Ithamar, for their reviewing in their service.

1 Chronicles 26:13-16

And they will cast lots, according to small according to great, for the house of their fathers, to gate and gate

Luke 1:8-9

And it was in his being priest, in the arranging of the daily order before God,

Treasury of Scripture Knowledge

Summary

This is the thing that ye shall do; A third part of you entering on the sabbath, of the priests and of the Levites, shall be porters of the doors;

Bible References

Entering

1 Chronicles 23:3
And the Levites will be numbered from the son of thirty years and above: and their number, for their craniums, for the men, thirty and eight thousand.
1 Chronicles 24:3
And David will separate them, and Zadok from the sons of Eleazar, and Ahimelech from the sons, of Ithamar, for their reviewing in their service.
Luke 1:8
And it was in his being priest, in the arranging of the daily order before God,

Porters

1 Chronicles 26:13
And they will cast lots, according to small according to great, for the house of their fathers, to gate and gate