(a) Amir bin Abdullah bin al-Zubayr narrates from his father (may Allah be pleased with them both) that when the Messenger of Allah (peace and blessings be upon him) was in the sitting, he would supplicate; he would place his right hand on his right thigh and his left hand on his left thigh, point with the index finger, place his thumb on his middle finger, and gently rest his left palm on his knee.
(b) In the narration of al-Layth bin Sa'd: When he (peace and blessings be upon him) sat in the prayer, he would place his right hand on his knee and point with his index finger.
(c) It is reported from Abu Salih that the Prophet (peace and blessings be upon him) saw Sa'd (may Allah be pleased with him) pointing with two of his fingers in the prayer, and said: "Point with one finger."
(d) A connected (mawsul) narration through another chain is also mentioned in the chapter on supplication.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2783