Ezekiel 33:3

And he saw the sword coming upon the land, and he struck upon the trumpet and warned the people;

Hosea 8:1

The trumpet to thy mouth: as an eagle upon the house of Jehovah, because they passed by my covenant and they transgressed against my laws.

Nehemiah 4:18

And the builders, a man his sword being girded upon his loins, and building. And he striking upon the trumpet near me.

Nehemiah 4:20

In the place which ye shall hear the voice of the trumpet there ye shall gather together to us; our God shall war for us.

Isaiah 58:1

Call with the throat; thou shalt not spare; as a trumpet lift up thy voice, and announce to my people their transgression, and to the house of Jacob their sin.

Joel 2:1

Clang ye the trumpet in Zion, shout in my holy mountain: all the inhabitants of the land shall be moved, for the day of Jehovah is coming, for it is near.

Jeremiah 4:5

Announce ye in Judah, and cause to be heard in Jerusalem; and say, Strike the trumpet in the land: call, fill up, and say, Be ye gathered together and we will go to the fortified cities.

Jeremiah 6:1

Be strong, ye sons of Benjamin, from the midst of Jerusalem, and in Tekoa strike the trumpet, and lift up a lifting up upon the house of the vineyard, for evil overhung from the north, and great breaking.

Jeremiah 51:27

Lift up a signal in the earth, strike ye the trumpet in the nations, consecrate the nations against her, cause ye to be heard against her the kingdoms of Ararat, Minni, and Ashchenaz; appoint over her a satrap; bring up the horse as the bristling locust

Ezekiel 33:8-9

In my saying to the, unjust, O unjust one, dying, thou shalt die; and thou spakest not to warn the unjust from his way, that unjust one shall die in his iniquity, and I will seek his blood from thine hand.

Treasury of Scripture Knowledge

Summary

If when he seeth the sword come upon the land, he blow the trumpet, and warn the people;

Bible References

He blow

Ezekiel 33:8
In my saying to the, unjust, O unjust one, dying, thou shalt die; and thou spakest not to warn the unjust from his way, that unjust one shall die in his iniquity, and I will seek his blood from thine hand.
Nehemiah 4:18
And the builders, a man his sword being girded upon his loins, and building. And he striking upon the trumpet near me.
Isaiah 58:1
Call with the throat; thou shalt not spare; as a trumpet lift up thy voice, and announce to my people their transgression, and to the house of Jacob their sin.
Jeremiah 4:5
Announce ye in Judah, and cause to be heard in Jerusalem; and say, Strike the trumpet in the land: call, fill up, and say, Be ye gathered together and we will go to the fortified cities.
Jeremiah 6:1
Be strong, ye sons of Benjamin, from the midst of Jerusalem, and in Tekoa strike the trumpet, and lift up a lifting up upon the house of the vineyard, for evil overhung from the north, and great breaking.
Jeremiah 51:27
Lift up a signal in the earth, strike ye the trumpet in the nations, consecrate the nations against her, cause ye to be heard against her the kingdoms of Ararat, Minni, and Ashchenaz; appoint over her a satrap; bring up the horse as the bristling locust
Hosea 8:1
The trumpet to thy mouth: as an eagle upon the house of Jehovah, because they passed by my covenant and they transgressed against my laws.
Joel 2:1
Clang ye the trumpet in Zion, shout in my holy mountain: all the inhabitants of the land shall be moved, for the day of Jehovah is coming, for it is near.
Amos 3:6
If the trumpet shall be struck in the city and the people not be terrified? if evil shall be in the city and Jehovah did not?
1 Corinthians 14:8
For also if the trumpet give an uncertain voice, who shall prepare himself for war?