Nehemiah 4:18-20

18All of the builders had swords tied on their belts while they were building. There was a man who would make a sound with his trumpet if there was danger. He stayed near me.

19I said to the leaders, the officers and all the people, ‘It is hard work and the wall is very long. So we are not working near to each other.

20When you hear the sound of the trumpet, come to join us here. Our God will fight on our behalf.’