It is narrated from Sayyiduna Wa'il bin Hujr (may Allah be pleased with him) that he said: "I saw the Prophet (peace and blessings be upon him) placing his right hand on the left; and when he sat, he would spread out his left foot, place his forearms on his thighs, and point with the index finger."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18298