Nehemiah 4:20

18Among the builders, everyone wore his sword at his side, and so built. He who sounded the trumpet was by me.

19I said to the nobles, and to the rulers and to the rest of the people, “The work is great and widely spread out, and we are separated on the wall, far from one another.

20Wherever you hear the sound of the trumpet, rally there to us. Our God will fight for us.”

21So we did the work. Half of the people held the spears from the rising of the morning until the stars appeared.

22Likewise at the same time I said to the people, “Let everyone with his servant lodge within Jerusalem, that in the night they may be a guard to us, and may labor in the day.”