Hadith 718
It is narrated from Sayyiduna Abdullah bin Zubair (may Allah be pleased with them both) that when the Prophet Muhammad (peace and blessings be upon him) sat in Tashahhud, he would place his left hand on his left thigh and his right hand on his right thigh, and he would gesture with his index finger. The gaze of the Prophet (peace and blessings be upon him) would not go beyond his gesture.