Muhammad bin 'Abdullah al-Ansari محمد بن عبد الله بن المثني - الأنصاري · Chapters On Al-Fitan

"The Messenger of Allah {s.a.w} narrated two narrations to us, one of which I have seen {happening} and I am waiting for the other. He narrated that (in the beginning) trust was preserved in the roots of the hearts of men, then the Qur'an was revealed, and they learned it from the Qur'an, and then they learned it from the Sunnah. Then he narrated to us about the disappearance of trust, saying, 'A man will go to sleep whereupon trust…