(a) Amir bin Abdullah bin al-Zubayr narrates from his father (may Allah be pleased with him) that he said: "When the Prophet (peace and blessings be upon him) supplicated in the tashahhud, he would point with his finger and would not move it."
(b) Amir narrates from his father (may Allah be pleased with him) that he saw the Prophet (peace and blessings be upon him) supplicating in the same way: "He (peace and blessings be upon him) had placed his left hand on his left thigh."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2786