Narrated Sahl bin Sa`d:
I saw Allah's Messenger (ﷺ) 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.
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 458
Arabic reference: Book 65, Hadith 4936