Sunan an-Nasa'i · Hadith 1323
The Book of Forgetfulness (In Prayer) - كتاب السهو
أخبرنا محمد بن آدم، عن عمر بن عبيد، عن أبي إسحاق، عن أبي الأحوص، عن عبد الله، قال كان رسول الله صلى الله عليه وسلم يسلم عن يمينه حتى يبدو بياض خده وعن يساره حتى يبدو بياض خده .
It was narrated that 'Abdullah said: "The Messenger of Allah (ﷺ) used to say the salam to his right so that the whiteness of his cheek could be seen, and to his left so that the whiteness of his cheek could be seen."
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).