not hear - because their prayers are hypocritical: their hearts are still idolatrous. God never refuses to hear real prayer (Jer 7:21, Jer 7:22; Pro 1:28; Isa 1:15; Isa 58:3).
sword ... famine ... pestilence - the three sorest judgments at once; any one of which would be enough for their ruin (2Sa 24:12, 2Sa 24:13).