In the thirty-seventh year of the exile of King Jehoiachin of Judah, Evil-merodach ascended to the Babylonian throne. He was kind to Jehoiachin and released him from prison on March 31 of that year.
References for Jeremiah 52:31
He spoke kindly to Jehoiachin and gave him a higher place than all the other exiled kings in Babylon.
He supplied Jehoiachin with new clothes to replace his prison garb and allowed him to dine in the king’s presence for the rest of his life.
So the Babylonian king gave him a regular food allowance as long as he lived. This continued until the day of his death.