In the Book of Titus we see how powerful and definitive Elders are in Churches. They are pillars of righteousness and spiritual light and power and they TEACH and EXHORT and CONVICT
Qualified Elders
5 For this reason I left you in Crete, that you should set in order the things that are lacking, and appoint elders in every city as I commanded you—6 if a man is blameless, the husband of one wife, having faithful children not accused of dissipation or insubordination. 7 For a bishop must be blameless, as a steward of God, not self-willed, not quick-tempered, not given to wine, not violent, not greedy for money, 8 but hospitable, a lover of what is good, sober-minded, just, holy, self-controlled, 9 holding fast the faithful word as he has been taught, that he may be able, by sound doctrine, both to exhort and convict those who contradict.
” (Titus 1:5–9, NKJV)