Silsilat al-Ahadith al-Sahihah

Lady Umm Salamah (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings of Allah be upon him) «إِنَّا لِلَّـهِ وَإِنَّا إِلَيْهِ رَاجِعُونَ» woke up from sleep saying this. I said: O Messenger of Allah! What happened to you? The Prophet (peace be upon him) said: "A group from my Ummah is being swallowed up (by the earth); they will follow a man who will attack Makkah. Allah, the Exalted, will protect Makkah and will cause all of them to be swallowed up by the earth. Their place of destruction will be the same, but their points of emergence (from the earth) will be different, because among them will be some people who came (not willingly, but) under compulsion."