C. F. Keil and Franz Delitzsch on Jeremiah 43:1-3

Jer 43:1-3 The march of the people to Egypt. - When Jeremiah had thus ended all the words which the Lord had announced to him for the people, then came forward Azariah (probably an error for Jezaniah, see on Jer 42:1) the son of Hoshaiah, Johanan the son of Kareah, and the rest of the insolent men, and said to Jeremiah, "Thou dost utter falsehood; Jahveh our God hath not sent thee unto us, saying, Ye must not go to Egypt to sojourn there; Jer 43:3. But Baruch the son of Neriah inciteth thee against us, in order to give us into the hand of the Chaldeans, to kill us, and to take us captive to Babylon." אמרים is not the predicate to כּל־האנשׁים, but forms a resumption of ויּאמר, with which it thus serves to connect its object, Jeremiah, and from which it would otherwise be pretty far removed. Azariah (or, more correctly, Jezaniah) occupies the last place in the enumeration of the captains, Jer 40:8, and in Jer 42:1 is also named after Johanan, who is the only one specially mentioned, in what follows, as the leader on the march. From this we may safely conclude that Jezaniah was the chief speaker and the leader of the opposition against the prophet. To avoid any reference to the promise they had made to obey the will of God, they declare that Jeremiah’s prophecy is an untruth, which had been suggested to him, not by God, but by his attendant Baruch, with the view of delivering up the people to the Chaldeans.