"Ye have lived in pleasure on the earth, and been wanton; ye have nourished your hearts, as in a day of slaughter." James 5:5
Dr. John Gill comments,
when beasts were slain for some extraordinary entertainment, or for the solemn festivals and sacrifices the Jews, when they lived more deliciously than at other times; and then the sense is, that these rich men fared sumptuously every day; every day was a festival with them; they indulged themselves in intemperance; they ate and drank, not merely what was necessary, and satisfying, and cheering to nature, but to excess, and gorged, and filled themselves in an extravagant manner: the Syriac version, instead of "hearts", reads "bodies" and one copy reads, "your flesh": and the last phrase may be rendered, as it is in the same version, "as unto", or "for the day of slaughter"; and so the Arabic version, "ye have nourished your hearts, as fattened for the day of slaughter": like beasts that are fattened in order to be killed, so were they preparing and fitting up by their sins for destruction.
"But thou, O LORD, knowest me: thou hast seen me, and tried mine heart toward thee: pull them out like sheep for the slaughter, and prepare them for the day of slaughter." Jeremiah 12:3
Again, John Gill,
either out of the fold, or from a fat pasture; so fat sheep are plucked from the rest, in order to be killed: this shows that their riches, affluence, and plenty, served but to ripen them for ruin and destruction, and were like the fattening of sheep for slaughter; which the prophet, by this imprecation, suggests and foretells would be their case, as a righteous judgment upon them;