A man who was afflicted was brought to Ibn Masud, and he recited into his ear "Did you think that We created you in vain, and that you would not be returned to Us? So exalted is Allah, the Sovereign, the Truth. There is no god but Him, Lord of the Noble Throne" [Muminun 23:115–116], until he completed the surah, and the man recovered.The Messenger of Allah ﷺ asked, "What did you recite into his ear?"Ibn Masud told him.The Messenger of Allah ﷺ said, "By the One in whose hand is my soul, if a man of certain faith recited it over a mountain, the mountain would move."
أن رجلا مصابا مر به علي ابن مسعود، فقرأ في أذنه: {أفحسبتم أنما خلقنكم عبثا وأنكم إلينا لا ترجعون فتعلى الله الملك الحق لا إله إلا هو رب العرش الكريم} حتى ختم السورة، فبرا. فقال رسول الله ﷺ: بماذا قرات في أذنه؟ فأخبره، فقال رسول الله ﷺ: والذي نفسي بيده! لو أن رجلا موقنا قرأها على جبل لزال.
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Ibn Abu Hatim narrated it in his Tafsir (8/2513), from Bahr bin Nasr Khawlani, who said, Ibn Wahb told us, Ibn Lahia informed me, from Ibn Hubayra, from Hanash bin Abdullah, and he related it.Its chain of transmission is hasan because of Ibn Lahia, since the one narrating from him is Abdullah bin Wahb, who is among those who took from him before his confusion set in.A note of caution, in the printed edition of Ibn Abu Hatim's Tafsir, and in Ibn Kathir's Tafsir, the name appears as "Yahya bin Nasr Khawlani," but the correct name is "Bahr bin Nasr Khawlani," for he is the teacher of Ibn Abu Hatim, and his own teacher is Ibn Wahb.