Jeremiah 38:9

Ebed-melech informed the king that Jeremiah’s enemies had acted wickedly by putting him in the cistern. The prophet would die if he remained there because there was no more food in Jerusalem and he would be neglected. Zedekiah had previously promised to provide food for Jeremiah as long as there was food available (Jeremiah 37:21), so Ebed-melech may have been appealing to this promise.

"God, as is His way so often, used an insignificant person to touch off Jeremiah’s rescue." [Note: Jensen, p. 100.]