Isaiah 58:1
"Cry aloud, spare not, lift up thy voice like a trumpet, and shew my people their transgression, and the house of Jacob their sins."
Cross References (ranked by relevance)
These things speak, and exhort, and rebuke with all authority. Let no man despise thee.
Set the trumpet to thy mouth. He shall come as an eagle against the house of the LORD, because they have transgressed my covenant, and trespassed against my law.
Wilt thou judge them, son of man, wilt thou judge them? cause them to know the abominations of their fathers:
Now, thou son of man, wilt thou judge, wilt thou judge the bloody city? yea, thou shalt shew her all her abominations.
His watchmen are blind: they are all ignorant, they are all dumb dogs, they cannot bark; sleeping, lying down, loving to slumber.
The voice said, Cry. And he said, What shall I cry? All flesh is grass, and all the goodliness thereof is as the flower of the field:
I was in the Spirit on the Lord’s day, and heard behind me a great voice, as of a trumpet,
And it shall come to pass in that day, that the great trumpet shall be blown, and they shall come which were ready to perish in the land of Assyria, and the outcasts in the land of Egypt, and shall worship the LORD in the holy mount at Jerusalem.
After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will shew thee things which must be hereafter.