John Gill Commentary Jeremiah 43:1

"And it came to pass that, when Jeremiah had made an end of speaking unto all the people all the words of Jehovah their God, wherewith Jehovah their God had sent him to them, even all these words," — Jeremiah 43:1 (ASV)

And it came to pass, [that] when Jeremiah had made an end of
speaking unto all the people
The princes and the people, the whole body of them, who had desired the prophet to seek the Lord for them, and whom he called together to relate his answer, and declare his will; see (Jeremiah 42:1Jeremiah 42:8) ; they heard him out, and that was as much as they did; for as soon as he had done, they rose up and contradicted him:

however, he faithfully declared all the words of the Lord their God, for which the Lord their God sent
him to them, [even] all the words ;
which are related in the preceding chapter, which were the words of the Lord, and so ought to have been regarded; and the rather, as they were the words of their God, whom they professed, and which he had sent his prophet to declare unto them; and who had kept back nothing, but had made known the whole; he had told the truth, and nothing but the truth, and all the truth.