Albert Barnes Commentary Jeremiah 21:2

"Inquire, I pray thee, of Jehovah for us; for Nebuchadrezzar king of Babylon maketh war against us: peradventure Jehovah will deal with us according to all his wondrous works, that he may go up from us." — Jeremiah 21:2 (ASV)

Nebuchadrezzar - A more correct way of spelling the name than Nebuchadnezzar.

According to all his wondrous works - The king and his envoys expected some such answer as Isaiah had given on a former occasion (Isaiah 37:6).