Sahih Muslim Book 41, Hadith Number 7044.
Chapter : Approach of the Last Hour.
This hadith has been reported by Sahl b. Sa’d that he heard Allah’s Messenger (may peace be upon him) as saying: I and the Last Hour are (close to each other) like this (and he, in order to explain it) pointed (by joining his) forefinger, (one) next to the thumb and the middle finger (together).