Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "The Qur'an is an intercessor whose intercession is accepted, and a witness whose testimony is 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 the Fire."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8623