From my blogpost over a year and a half ago…
The Lord hath said concerning you, O ye remnant of Judah; Go ye not into Egypt: know certainly that I have admonished you this day. 20 For ye dissembled in your hearts, when ye sent me unto the Lord your God, saying, Pray for us unto the Lord our God; and according unto all that the Lord our God shall say, so declare unto us, and we will do it (Jer 42:19-20 KJV).
What the remnant of Judah did was not out of ignorance, but out of rebellion. The LORD plainly predicts what their choice will be, knowing that they had already made up their minds before coming to Jeremiah.
Source: Jeremiah 42&43