It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The Qur'an is an intercessor whose intercession will be accepted, and an advocate whose word will be believed. Whoever puts it in front of him, it will lead him to Paradise, and whoever casts it behind him, it will drive him to Hell."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10412