Proverbs 26:21 New English Translation

²¹Like charcoal is to burning coals, and wood to fire,
so is a contentious person^[a] to kindle strife.^[b]

Proverbs 26:21 sn Heb “a man of contentions”; NCV, NRSV, NLT “a quarrelsome person.” The expression focuses on the person who is contentious by nature. His quarreling is like piling fuel on a fire that would otherwise go out. This kind of person not only starts strife, but keeps it going.
Proverbs 26:21 tn The Pilpel infinitive construct לְחַרְחַר (l^ekharkhar) from חָרַר (kharar, “to be hot; to be scorched; to burn”) means “to kindle; to cause to flare up.”

New English Translation (NET)