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 who does not slander with his tongue, nor does evil to his friend, nor takes up a reproach against his neighbor;
A [self-confident] fool's lips bring contention, and his mouth invites a beating. A [self-confident] fool's mouth is his ruin, and his lips are a snare to himself.
But now I write to you not to associate with anyone who bears the name of [Christian] brother if he is known to be guilty of immorality or greed, or is an idolater [whose soul is devoted to any object that usurps the place of God], or is a person with a foul tongue [railing, abusing, reviling, slandering], or is a drunkard or a swindler or a robber. [No] you must not so much as eat with such a person.
Nor cheats (swindlers and thieves), nor greedy graspers, nor drunkards, nor foulmouthed revilers and slanderers, nor extortioners and robbers will inherit or have any share in the kingdom of God.
To slander or abuse or speak evil of no one, to avoid being contentious, to be forbearing (yielding, gentle, and conciliatory), and to show unqualified courtesy toward everybody.
[My] brethren, do not speak evil about or accuse one another. He that maligns a brother or judges his brother is maligning and criticizing the Law and judging the Law. But if you judge the Law, you are not a practicer of the Law but a censor and judge [of it].