Proverbs 27:5
Better is open protest than love kept secret.
Proverbs 28:23
He who says words of protest to a man will later have more approval than one who says smooth words with his tongue.
Galatians 2:14
But when I saw that they were not living uprightly in agreement with the true words of the good news, I said to Cephas before them all, If you, being a Jew, are living like the Gentiles, and not like the Jews, how will you make the Gentiles do the same as the Jews?
Leviticus 19:17
Let there be no hate in your heart for your brother; but you may make a protest to your neighbour, so that he may be stopped from doing evil.
Matthew 18:15
And if your brother does wrong to you, go, make clear to him his error between you and him in private: if he gives ear to you, you have got your brother back again.
1 Timothy 5:20
Say sharp words to sinners when all are present, so that the rest may be in fear.