Probably these elders were some of the court, or else advocates, for they were wont to rise up, either to plead or to judge, Isaiah 3:13 Acts 5:34. They rise up and apply themselves to the people to justify their absolutory sentence.
Related Commentaries of Jeremiah 26:17
Jeremiah 26:17
17 Then rose up certain of the elders of the land, and spake to all the assembly of the people, saying,