This refers to the final outcome for the weeds. Their being thrown symbolically into the fiery furnace indicates that they are headed for eternal destruction.
(‏ رؤ ٢٠ :‏ ١٤ ؛‏ ٢١ :‏ ٨‏ )‏ فَٱلْمَسِيحِيُّونَ ٱلزَّائِفُونَ ٱلْمُشَبَّهُونَ بِٱلزِّوَانِ ،‏ أَيِ ٱلدَّجَّالُونَ ،‏ سَيُبَادُونَ فِي ‹ ٱلضِّيقِ ٱلْعَظِيمِ › .‏ —‏ مت ٢٤ :‏ ٢١‏ .‏