Exodus 23:1
You shall not raise a false report: put not your hand with the wicked to be an unrighteous witness.
Torrey's Topical Textbook—AKJV

Ephesians 4:31
Let all bitterness, and wrath, and anger, and clamor, and evil speaking, be put away from you, with all malice:
Torrey's Topical Textbook—AKJV

James 4:11
Speak not evil one of another, brothers. He that speaks evil of his brother, and 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.
Torrey's Topical Textbook—AKJV