مَّٰكِثِينَ فِيهِ أَبَدًا
Commentary:
If the verse be taken as referring to the reward of believers in Paradise, it would mean that that reward will last forever and will know no end or diminution. But if it refers to the good reward of this world, then the verse would mean that believers will get a good reward so long as they do good deeds. The continuity of their good reward would depend upon the continuity of their good and righteous deeds.