Nehemiah 4:20

4:19 Then 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.

4:20 Wherever you hear the sound of the trumpet, rally to us there. Our God will fight for us."

4:21 So we labored in the work, and half of the men held the spears from daybreak until the stars appeared.