Quranic Verses

O mankind! There has come to you a good advice from your Lord (i. e. the Qur'an, enjoining all that is good and forbidding all that is evil), and a healing for that (disease of ignorance, doubt, hypocrisy and differences) which is in your breasts, a guidance and a mercy (explaining lawful and unlawful things) for the believers. (10:57)

Hadith

996. `Umar bin Al-Khattab (May Allah be pleased with him) reported: The Prophet (PBUH) said, "Verily, Allah elevates some people with this Qur'an and abases others.''[Muslim].