New Defender's Study Bible Notes
42:2 pray for us. Johanan and the rest of God’s remnant in Judah, with apparent piety and in respect of Jeremiah’s now-confirmed reputation as a true prophet of God, requested that he pray for God to reveal His will concerning their next move. However, this was merely a sham, since they had already determined what they wanted God to tell them to do (Jeremiah 42:20).
42:17 they shall die. Even after a hypocritical appeal to Jeremiah for guidance about whether to remain in the land, Johanan and his followers rejected his counsel and hurried into Egypt, even taking Jeremiah and Baruch with them.
42:20 ye dissembled in your hearts. It is foolish to expect God to answer a prayer for guidance if we have already made up our minds what we will or will not do. He does promise to answer such prayers if we are sincerely willing to follow His will before we learn what it is. See notes on John 7:17 and Romans 12:1-2.