Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "What I fear most for my Ummah is two things: that they follow the verses and desires and abandon the Qur'an and the prayers, and that the hypocrites learn it and dispute by means of it with the people of knowledge."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14890