Nehemiah 4:18

As for the builders, each wore his sword girded at his side as he built, while the trumpeter stood near me.

Numbers 10:9

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

2 Chronicles 13:12-17

Now behold, God is with us at our head and His priests with the signal trumpets to sound the alarm against you. O sons of Israel, do not fight against the Lord God of your fathers, for 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 you go to war in your land against the adversary who attacks you, then you shall sound an alarm with the trumpets, that you may be remembered before the Lord your God, and be saved from your enemies.
2 Chronicles 13:12
Now behold, God is with us at our head and His priests with the signal trumpets to sound the alarm against you. O sons of Israel, do not fight against the Lord God of your fathers, for you will not succeed.”

General references

1 Corinthians 12:21
And the eye cannot say to the hand, “I have no need of you”; or again the head to the feet, “I have no need of you.”
1 Corinthians 14:8
For if the bugle produces an indistinct sound, who will prepare himself for battle?