'Unquenchable Fire' in the Bible

whose winnowing-shovel is in his hand, and he will thoroughly cleanse his thrashing-floor, and gather his grain into his granary; but the chaff he will burn with unquenchable fire.

His winnowing shovel is in his hand, and he will thoroughly cleanse his thrashing-floor, and gather the grain into his granary, but the chaff he will burn with unquenchable fire.