Sahih Bukhari
Prophetic Commentary on the Quran (Tafseer of the Prophet (PBUH))
Volume: 006 / Book Number: 060 / Hadith Number: 458
Narrated Sahl bin Sad:
I saw Allah's Apostle pointing with his index and middle fingers, saying. "The time of my Advent and the Hour are like these two fingers." The Great Catastrophe will overwhelm everything.