And I said unto the nobles, and to the rulers, and to the rest of the people, The work is great and large, and we are separated upon the wall, one far from another. In whatever place therefore you hear the sound of the trumpet, come you there unto us: our God shall fight for us. So we labored in the work: and half of them held the spears from the rising of the morning till the stars appeared.

Likewise at the same time said I unto the people, Let every one with his servant lodge within Jerusalem, that in the night they may be a guard to us, and labor during the day. So neither I, nor my brethren, nor my servants, nor the men of the guard who followed me, none of us put off our clothes, saving that every one put them off for washing.
(Nehemiah 4:19-23)