It is narrated from Ibn Abi Mulaykah (may Allah have mercy on him) that he said: One day I went early in the morning to Sayyiduna Ibn Abbas (may Allah be pleased with them both), and he said: "I could not sleep last night until morning." I asked: "Why?" He said: "People said that a comet has appeared, so I feared that the Smoke (a sign of the Hour) might have arrived." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it in their books; however, it goes against the position of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), according to whom the sign of the Smoke has already passed.