Jeremiah
Jeremiah 41:7BSB·traditional attribution

And when they came into the city, Ishmael son of Nethaniah and the men with him slaughtered them and threw them into a cistern.

John Calvin Reformed @genevareformer

Here Jeremiah relates another circumstance in the nefarious conduct of Ishmael, that by flatteries he enticed simple men, who feared no evil, and while pretending kindness, slew them. The slaughter was in itself very detestable, but added to it was the most abominable deceit, for he pretended to weep with them, and offered an act of kindness, to bring them to Gedaliah, and then he traitorously killed them!

Matthew Henry Presbyterian @wholebiblehenry

It is hard to say which is more astonishing, God's permitting or men's perpetrating such villanies as here we find committed. Such base, barbarous, bloody work is here done by men who by their birth should have been men of honour, by their religion just men, and this done upon those of their own nature, their own nation, their own religion, and now their brethren...

Commenting on Jeremiah 41:1-10

John Gill Reformed Baptist @doctorgill

And it was so, when they came into the midst of the city,.... Where Gedaliah's house was, to which he invited them; and as they went in, he shut up the court, as Josephus (h) says, and slew them, as it here follows: that Ishmael the son of Nethaniah slew them, and cast them into the midst of the pit; when he had slain them...