'Watches' in the Bible

And I said unto them, Let not the gates of Jerusalem be opened until the sun be hot; and while they stand by, let them shut the doors, and bar them: and appoint watches of the inhabitants of Jerusalem, every one in his watch, and every one to be over against his house.

Also Bakbukiah and Unni, their brethren, were over against them in the watches.

So I made them clean from all strange people, and had regular watches fixed for the priests and for the Levites, everyone in his work;