Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "Whoever wishes to know whether he loves Allah and His Messenger (peace and blessings be upon him), let him look: if he loves the Qur'an, then he loves Allah and His Messenger (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8625