Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: In the Qur'an there are two cures: the Qur'an and honey. The Qur'an heals the hearts, and honey heals diseases.
This is the sound version, mawquf (a statement of the Companion).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19566