'Blow the Trumpet' in the Bible

Declare ye in Judah, and cause it to be heard in Jerusalem, and say, ... and blow the trumpet in the land, cry aloud and say, Assemble yourselves, and let us enter into the fenced cities.

O ye children of Benjamin, gather yourselves to flee out of the midst of Jerusalem, and blow the trumpet in Tekoa, and set up a sign of fire in Bethhaccerem: for evil appeareth out of the north, and great destruction.

Set ye up a standard in the land, blow the trumpet among the nations, prepare the nations against her, call together against her the kingdoms of Ararat, Minni, and Ashchenaz; appoint a captain against her; cause the horses to come up as the rough caterpillers.