The Messenger of Allah (ﷺ) used to say salam to his right:As-salamu 'alaykum wa rahmatullah (peace be upon you and the mercy of Allah) , until the whiteness of his right cheek could be seen, and to his left: As-salamu 'alaykum wa rahmatullah (peace be upon you and the mercy of Allah) until the whiteness of his left cheek could be seen.
Reference: Sunan an-Nasa'i 1325 In-book : Book 13, Hadith 147 English translation : Vol. 2, Book 13, Hadith 1326
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