Reference: Evil-speaking
Easton
is expressly forbidden (Tit 3:2; Jas 4:11), and severe punishments are denounced against it (1Co 5:11; 6:10). It is spoken of also with abhorrence (Ps 15:3; Pr 18:6-7), and is foreign to the whole Christian character and the example of Christ.
See Verses Found in Dictionary
He does not slander with his tongue. He does not harm his friend, nor {bring up} a disgrace against his neighbor.
The lips of a fool will bring strife, and his mouth calls out for a flogging. The mouth of a fool [is] ruin to him, and his lips [are] a snare to his soul.
But now I have written to you not to associate with any so-called brother, if he is a sexually immoral person or a greedy person or an idolater or an abusive person or a drunkard or a swindler--with such a person not even to eat.
nor thieves, nor greedy persons, not drunkards, not abusive persons, not swindlers will inherit the kingdom of God.
to speak evil of no one, to be peaceable, gentle, showing all courtesy to all people.
Do not speak evil of one another, brothers. The one who speaks evil of a brother or judges his brother speaks evil of the law and judges the law. But if you judge the law, you are not a doer of the law but a judge [of the law].