´Sayyiduna Hudhaifah (may Allah be pleased with him) says that` the Messenger of Allah (peace and blessings be upon him) delivered a sermon to us (one day) and mentioned everything that is to happen until the Day of Resurrection. Whoever was to remember it, remembered it, and whoever was to forget it, forgot it. And whatever I have forgotten, when I see it (happen), I recognize it just as a man recognizes someone who had been absent, and then when he sees him, he recognizes him.