Proverbs 3:30 New English Translation

³⁰Do not accuse^[a] anyone^[b] without legitimate cause,^[c]
if he has not treated you wrongly.

Proverbs 3:30 sn The term רִיב (riv) can mean “quarrel” or “legal accusation” (BDB 936 s.v.). Both ideas would work but the more technical legal accusation fits the context better. This is a warning to not bring legal accusations against anyone without a legitimate reason.
Proverbs 3:30 tn Heb “a man.”
Proverbs 3:30 tn Heb “gratuitously”; NIV, TEV “for no (+ good NCV) reason.” The adverb חִנָּם (khinam) means “without cause, undeservedly,” especially of groundless hostility (HALOT 334 s.v. 3; BDB 336 s.v. c).

New English Translation (NET)