Nehemiah 4:20 ASV

¹⁸  and the builders, every one had his sword girded by his side, and so builded. And he that sounded the trumpet was by me.

¹⁹  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:

²⁰  in what place soever ye hear the sound of the trumpet, resort ye thither unto us; our God will fight for us.

²¹  So we wrought in the work: and half of them held the spears from the rising of the morning till the stars appeared.

²²  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 may labor in the day.