Reference: Evil Speaking
Hastings
EVIL SPEAKING in the Bible covers sins of untruthfulness as well as of malice. It includes abuse, thoughtless talebearing, imputing of bad motives, slander, and deliberate false witness. Warnings against it are frequent; it is forbidden in the legislation of the OT (Ninth Commandment; De 19:16-19) and of the NT (Mt 5:22; 12:32; 15:19). Christians must expect this form of persecution (Mt 5:11), but must be careful to give no handle to it (Ro 14:16; Tit 2:8; 1Pe 2:12; 3:16).
C. W. Emmet.
See Verses Found in Dictionary
If {a malicious witness} gets up {to accuse} anyone to testify against him falsely, then the two men {to whom the legal dispute pertains} shall stand {before} Yahweh, {before} the priests and the judges who are [in office] in those days. read more. Then judges shall make a thorough inquiry, and [if] it turns out that the witness is a false witness [and] he testified falsely against his brother, then you shall do to him as he meant to do to his brother, and so you shall purge the evil from your midst.
Blessed are you when they insult you and persecute [you] and say all kinds of evil things against you, lying on account of me.
But I say to you that everyone who is angry at his brother will be subject to judgment, and whoever says to his brother, 'Stupid fool!' will be subject to the council, and whoever says, 'Obstinate fool!' will be subject to fiery hell.
And whoever speaks a word against the Son of Man, it will be forgiven him. But whoever speaks against the Holy Spirit, it will not be forgiven him either in this age or in the coming one!
For from the heart come evil plans, murder, adultery, sexual immorality, theft, false witness, abusive speech.
sound message beyond reproach, in order that {an opponent} may be put to shame, [because he] has nothing bad to say concerning us.