Musnad Abu Ya'la al-Mawsili 151:79

Dawud ibn Rashid narrated to us, al-Walid ibn Muslim narrated to us, from Ibn Lahi'ah, from Abdullah ibn Hubayrah, from Hanash al-San'ani, from Abdullah, that he recited into the ear of an afflicted person, and he recovered. The Messenger of Allah (ﷺ) said to him, "What did you recite into his ear?" He said, "I recited: 'Did you then think that We had created you in play (without any purpose)?' [Al-Mu'minun: 115] until he finished the end of the Surah." The Messenger of Allah (ﷺ) said, "If a man who is certain (in faith) were to recite it over a mountain, it would move."