Commentaries:
Jamieson, Fausset, and Brown
and cast them into . . . pit—He had not killed them in the pit (compare Jeremiah 41:9); these words are therefore rightly supplied in English Version. "The pit" or cistern made by Asa to guard against a want of water when Baasha was about to besiege the city (I Kings 15:22). The trench or fosse round the city [GROTIUS]. Ishmael's motive for the murder seems to have been a suspicion that they were coming to live under Gedaliah.
Other Jamieson, Fausset, and Brown entries containing Jeremiah 41:7:
Leviticus 25:32-34
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