Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "The first thing you will lose of your religion is trustworthiness (amanah), and the last thing of your religion to remain is the prayer; and people will pray who have no religion; and the Qur'an will surely be taken away from among you." The people said: O Abu Abd al-Rahman, will we not be reciting the Qur'an when we have written it down in our Mushafs? He said: "The Qur'an will be taken away by night, and it will be taken from the breasts of men, and then nothing of it will remain on the earth."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8668