John Gill Commentary Jeremiah 42:6

"Whether it be good, or whether it be evil, we will obey the voice of Jehovah our God, to whom we send thee; that it may be well with us, when we obey the voice of Jehovah our God." — Jeremiah 42:6 (ASV)

Whether [it be] good, or whether [it be] evil
Not morally good, or evil; for nothing but what is good, and not evil, in this sense, can come from God; but whether pleasantly or profitably good or evil; whether agreeable or disagreeable, pleasing or displeasing, advantageous or not; whether it seemed to them good or evil, be it what it would in their opinion and esteem:

we will obey the voice of the Lord our God, to whom we send thee ;
this was well spoken, had they been sincere in it; and had they implored and depended on the grace of God to have enabled them to obey; but they spoke not in the uprightness of their hearts; and, did they, it was with too much confidence of their own strength, and the power of their free will:

that it may be well with us, when we obey the voice of the Lord our
God ;
they spoke as if they knew their own interest; for so it was, that it was well or ill with those people, as they obeyed or disobeyed the voice of the Lord; and yet they acted not according to it; and, what was worse still, did not intend it.

What a wretched scene of hypocrisy is here!