My servants the prophets; those prophets who in prophesying were my servants, revealing my will unto you. Hearkening here is the same with hearkening unto God's laws mentioned Jeremiah 26:4. Whom I sent unto you, both rising up early, and sending them; whom I have made my business to send unto you; and to whom you ought therefore to have hearkened, as unto me, but you have not done it hitherto, 2 Chronicles 36:12,16.
Related Commentaries of Jeremiah 26:5
Jeremiah 26:5
5 To hearken to the words of my servants the prophets, whom I sent unto you, both rising up early, and sending them, but ye have not hearkened;