The Messenger of Allah ﷺ said, "The best of remedies is the Quran."
حدثنا محمد بن عبيد بن عتبة بن عبد الرحمن الكندي حدثنا علي بن ثابت حدثنا سعاد بن سليمان عن أبي إسحق عن الحارث
قال رسول الله ﷺ خير الدواء القرآن
No references are available.
[Its chain of transmission is daif] Abu Naeem narrated it in Akhbar Isbahan: 1/265, from the hadith of Sufyan Thawri, from Abu Ishaq, with this wording. The hadith has several defects, among them the weakness of Harith Awar, mentioned previously, hadith no. 95.