1 Chronicles 9:23-27

So they and their children had the oversight of the gates of the house of the LORD, namely, the house of the tabernacle, by wards.

In four quarters were the porters, toward the east, west, north, and south.

And their brethren, which were in their villages, were to come after seven days from time to time with them.

For these Levites, the four chief porters, were in their set office, and were over the chambers and treasuries of the house of God.

And they lodged round about the house of God, because the charge was upon them, and the opening thereof every morning pertained to them.