Nehemiah 4:18

Every builder had his sword secured at his side as he built. And the one who sounded the trumpet [to summon the troops] stood at my side.

Numbers 10:9

When you go to war in your land against the enemy that attacks you, then sound an alarm with the trumpets, so that you may be remembered before the Lord your God, and you shall be saved from your enemies.

2 Chronicles 13:12-17

Behold, God is with us at our head, and His priests [are here] with their signal trumpets to sound an alarm against you. O sons of Israel, do not fight against the Lord God of your fathers, for you cannot 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 you go to war in your land against the enemy that attacks you, then sound an alarm with the trumpets, so that you may be remembered before the Lord your God, and you shall be saved from your enemies.
2 Chronicles 13:12
Behold, God is with us at our head, and His priests [are here] with their signal trumpets to sound an alarm against you. O sons of Israel, do not fight against the Lord God of your fathers, for you cannot succeed.”

General references

1 Corinthians 12:21
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
And if the [war] bugle produces an indistinct sound, who will prepare himself for battle?