Albert Barnes Commentary Jeremiah 26:10

"And when the princes of Judah heard these things, they came up from the king`s house unto the house of Jehovah; and they sat in the entry of the new gate of Jehovah`s [house]." — Jeremiah 26:10 (ASV)

The princes of Judah - The priests could scourge a man and so forth, but could not then try him for his life, as the Sanhedrin subsequently did until the Romans deprived them of the power.

The new gate - That built by Jotham (2 Kings 15:35), and probably a usual place for trials.