Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: This verse was revealed: "O people! Fear your Lord. Indeed, the earthquake of the Hour is a tremendous thing." This verse was revealed to the Prophet (peace and blessings be upon him) while he was traveling. He recited it in a loud voice until his companions gathered near him. He said: Do you know what day this is? (Meaning, what day is the Day of Resurrection?) On that day, Allah Almighty will say to Sayyiduna Adam (peace be upon him): O Adam, stand up and take out from every thousand, nine hundred and ninety-nine people to be sent to Hell. (The narrator says) This was very hard on the Muslims, so the Prophet (peace and blessings be upon him) said: Remain steadfast, be moderate, and receive glad tidings. By the One in Whose hand is my soul, your example among the people is like the mark on the side of a camel, or like the mark on the leg of an animal. There are two kinds of creatures with you. Whenever these two are joined with anyone, they increase his number—they are Gog and Magog, and the destroyed disbelieving jinn and humans.