It is narrated from Sayyiduna Wa'il bin Hujr al-Hadrami (may Allah be pleased with him) that he prayed with the Prophet (peace and blessings be upon him). When he (peace and blessings be upon him) said the takbir, he raised his hands; when he prostrated, he kept his upper arms away from his armpits; and when he sat, he spread out his left foot, placed his left hand on his left thigh and his right hand on his right thigh, and pointed with his index finger.
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18303