The Holy Quran 18:3 — Surah Al-Kahf
Arabic text
مَّـٰكِثِينَ فِيهِ أَبَدًا
Translation
in which (Jannah) they will live forever.
Tafsir (excerpt) — Tafsir Usmani
Apparently what is meant here is the recompense of the Hereafter, that is, Paradise, where the obedient believers will receive everlasting joy and eternal comfort.
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