The Messenger of Allah ﷺ used to give the salutation in his prayer to his right and to his left until the whiteness of his cheeks could be seen.
حدثنا يحيى بن إسحاق حدثنا ابن لهيعة عن محمد بن عبد الله بن مالك
أن رسول الله ﷺ كان يسلم في صلاته عن يمينه وعن يساره حتى يرى بياض خديه