It wasnarrated that 'Ammar bin Yasir said:
"The Messenger of Allah(ﷺ) used to say the Salam to his right and to his left, until thewhiteness of his cheek could be seen (saying): 'As-salamu 'alaikumwarahmatullah, as-salamu 'alaikum wa rahmatullah.'" (ID)
English reference (ID): Vol. 1, Book 5, Hadith 916 (ID)
Arabic reference (ID): Book 5, Hadith 969 (ID)