Nehemiah 4:18-20

18Every one of the builders had his sword girded at his side as he built. And the one who sounded the trumpet was beside me.

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

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