مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3864
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah (رضي الله عنه) said: I did not forget, among the things I forgot from The Messenger of Allah (ﷺ), that he used to say salam to his right, as-salamu 'alaikum wa rahmutullah, (turning) so far that the whiteness of his cheek could to seen, and to his left, as-salamu ‘alaikum wa rahmatullah, (turning) so far that the whiteness of his cheek could be seen.
Musnad Ahmad 3887Saheeh, this is a da’eef isnad because Jabir is da'eef- he i