Jeremiah 41:8

But ten men were found among them, the eighty who fell into Ishmael's trap, that said unto Ishmael, Slay us not, for we have treasures in the field, of wheat, and of barley, and of oil, and of honey, for it was customary for men to hide their stores of grain and fruit in underground bins during troublous times in order to prevent their being taken by invading hordes. So he forbare and slew them not among their brethren, very likely taking their goods as a ransom for their lives, for the motive for Ishmael's crime seems to have been plain robbery, since he was evidently a wild and lawless man.