Charles Ellicott Commentary Jeremiah 14:12

"When they fast, I will not hear their cry; and when they offer burnt-offering and meal-offering, I will not accept them; but I will consume them by the sword, and by the famine, and by the pestilence." — Jeremiah 14:12 (ASV)

An oblation. —The minchah or meat-offering of Leviticus 2:1. We need not assume that the fast and the sacrifice were necessarily hypocritical, though doubtless much of this mingled itself with the worship of Israel now as it had done in the days of Isaiah, and met with a like rejection (Isaiah 1:15). The lesson here is rather that they came too late to stay the discipline of chastisement.

By the sword, and by the famine, and by the pestilence, —The history of the world shows how constantly the latter plagues have followed in the wake of the former, and the union of the three has become proverbial (Leviticus 26:25–26; Ezekiel 5:12). In Ezekiel 14:21 the noisome beast is added to make up the list of the four sore judgments of God.