Sunan Ibn Majah Book 5, Hadith 112
“As-salamu ‘alaikum wa rahmatullah
(Peace be upon you and the mercy of Allah).”
It was narrated from Ibn ‘Umar that the Prophet (ﷺ) used to sit during prayer, putting his hands on his knees and raising his right finger which was next to his thumb, supplicating with it, and with his left hand (spread out) on his knee.
It was narrated from ‘Amir bin Sa’d, from his father, that the Messenger of Allah (ﷺ) used to say the Salam to his right and to his left.