Sahih Muslim
The Book Pertaining to the Turmoil and Portents of the Last Hour (Kitab Al-Fitan wa Ashrat As-Saah)
Book Number: 041 / Hadith Number: 7049
Anas reported Allah's Messenger (may peace be upon him) as saying: I and the Last Hour have been sent like this and (he while doing it) joined the forefinger with the middle finger.