Sahih Muslim Book 4, Hadith Number 1895.

Chapter : Warning on neglecting Jumu’a.

Umara b. Ruwaiba said he saw Bishr b. Marwan on the pulpit raising his hands and said: Allah, disfigure these hands! I have seen Allah’s Messenger (may peace be upon him) gesture no more than this with his hands, and he pointed with his forefinger.