Nehemiah 4:18

16From that time forth, half of my servants did the work, and half of them held the spears, the shields, the bows, and the coats of mail; and the rulers were behind all the house of Judah.

17Those who built the wall, and those who bore burdens loaded themselves; everyone with one of his hands did the work, and with the other held his weapon.

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.”