Charles Spurgeon 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)

After being long provoked, God at last determines that he will punish the rebellious nation, and he seems, as it were, to set Jeremiah aside; now the day of my vengeance has come, and I will show no more mercy to them. Now note what Jeremiah does even after the Lord has said to him, "Pray not for this people for their good."