Albert Barnes Commentary Jeremiah 32:1

"The word that came to Jeremiah from Jehovah in the tenth year of Zedekiah king of Judah, which was the eighteenth year of Nebuchadrezzar." — Jeremiah 32:1 (ASV)

The siege of Jerusalem began in Zedekiah’s ninth year (Jeremiah 39:1), but was temporarily raised upon the approach of an Egyptian army. See Jeremiah 37:0;Jeremiah 38:0.