Nehemiah 7:2

Now it came to pass, when the wall was built, and I had set up the doors, and the porters and the singers and the Levites were appointed,

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.