Spake all these Words unto Zedekiah - He delivered this message at the hazard of his life. Jeremiah feared God, and had no other fear.
Matthew Henry
Concise Bible Commentary
Zedekiah is told that the city shall be taken, and that he shall die a captive, but he shall die a natural death. It is better to live and die penitent in a prison, than to live and die impenitent in a palace.