Nehemiah 4:18

Every builder was working with his sword at his side. By my side was a man for sounding the warning horn.

Numbers 10:9

When there is war in your land and you defend yourselves against an enemy attack, sound the signal for battle on these trumpets. I, Jehovah your God, will help you and save you from your enemies.

2 Chronicles 13:12-17

God is with us as our leader. His priests will sound their trumpets to call the army to fight you. Men of Israel do not wage war against Jehovah the God of your ancestors. You will not succeed.

Treasury of Scripture Knowledge

Summary

For the builders, every one had his sword girded by his side, and so builded. And he that sounded the trumpet was by me.

Bible References

He that sounded

Numbers 10:9
When there is war in your land and you defend yourselves against an enemy attack, sound the signal for battle on these trumpets. I, Jehovah your God, will help you and save you from your enemies.
2 Chronicles 13:12
God is with us as our leader. His priests will sound their trumpets to call the army to fight you. Men of Israel do not wage war against Jehovah the God of your ancestors. You will not succeed.

General references

1 Corinthians 12:21
And the eye cannot say to the hand, I have no need of you: nor again the head to the feet, I have no need of you.
1 Corinthians 14:8
If the trumpet gives an unclear sound, who will prepare himself for the battle?