عَنْ سَهْلِ بْنِ مُعَاذٍ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُمَا عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ مَنْ قَرَأَ أَوَّلَ سُورَةِ الْكَهْفِ وَآخِرَهَا كَانَتْ لَهُ نُورًا مِنْ قَدَمَيْهِ إِلَى رَأْسِهِ وَمَنْ قَرَأَهَا كُلَّهَا كَانَتْ لَهُ نُورًا مَا بَيْنَ السَّمَاءِ وَالْأَرْضِ
Narrated by Sayyiduna Mu'adh bin Anas al-Juhani (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever recites the initial or last verses of Surah Al-Kahf, there will be light for him from his feet to his head, and whoever recites the entire Surah, there will be light for him from the earth to the sky.