It is narrated from Sayyiduna Thawban (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware! The millstone of Islam is turning." The narrator said: I said: O Messenger of Allah, what should we do? He (peace and blessings be upon him) said: "Present my hadith to the Book of Allah; whatever agrees with it is from me, and I am the one who said it."
Hadith Referenceالمعجم الكبير للطبراني / باب الثاء / 1416