Albert Barnes' Notes on the Whole Bible - Jeremiah 40:14
It is difficult to say what object Baalis can have had in murdering Gedaliah. As an ally of Zedekiah Jeremiah 27:3, he may have had a spite against the family of Ahikam for opposing, as most probably they did at Jeremiah’s instigation, the league proposed Jeremiah 27:0. Ishmael’s motive was envy and spite at seeing a subject who had always opposed the war now invested with kingly power, in place of the royal family. read more
The Pulpit Commentary - Jeremiah 40:14
Baalis the king of the Ammonites. Perhaps the same king referred to in Jeremiah 27:3 as seeking alliance with Zedekiah. He was naturally opposed to the Babylonian official, Gedaliah. Hath sent Ishmael. Ishmael was connected with the royal family ( Jeremiah 41:1 ), and was probably jealous of Gedaliah. read more