Thomas Aquinas Commentary Jeremiah 41:9

"Now the pit wherein Ishmael cast all the dead bodies of the men whom he had slain, by the side of Gedaliah (the same was that which Asa the king had made for fear of Baasha king of Israel,) Ishmael the son of Nethaniah filled it with them that were slain." — Jeremiah 41:9 (ASV)

1. Here, he speaks of the burial of their bodies: king Asa. In 1 Kings 15:22, it is said that Asa caused Geba of Benjamin in Mizpah to be built from the materials which Baasha had prepared for the fortification of Ramah against him, and as it happens, he had made a cistern for the defense of the city. I am reckoned with those that go down into the pit, I am become as a man without helper, free among the dead (Psalms 87:4–5).