hear: Dr. Blayney thinks there were two letters written by the prophet to the captives in Babylon, and the first ends with this verse. That having heard, on the return of the embassy, that the captives had received his advice favourably, and because they were deceived by false prophets, who promised them a speedier deliverance, he therefore wrote a second letter, beginning with the Jeremiah 29:15, and going on with the twenty-first, etc. (in which order these verses are read in the Septuagint), in which he denounces God's judgments on the three chief of those, Ahab, Zedekiah, and Shemaiah.
all ye: Ezekiel 3:11, Ezekiel 3:15
whom: Jeremiah 24:5; Micah 4:10