John Gill Commentary Jeremiah 21:3

"Then said Jeremiah unto them, Thus shall ye say to Zedekiah:" — Jeremiah 21:3 (ASV)

Then said Jeremiah unto them
The two priests, Pashur and Zephaniah, after he had sought the Lord, and knew his mind and will: thus shall you say to Zedekiah ;
by whom they were sent.