I used to see the Messenger of Allah ﷺ give the salam to his right and to his left, until I could see the whiteness of his cheek.
كنت أرى رسول الله ﷺ يسلم عن يمينه، وعن يساره، حتى أرى بياض خده.
Muslim narrated it in "The Mosques" (582) from Ishaq bin Ibrahim, Abu Amir Aqadi informed us, Abdullah bin Jafar narrated to us, from Ismail bin Muhammad, from Amir bin Saad, from his father, and he related it.