مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2587
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (ﷺ) that He came to the Prophet (ﷺ) when he was praying: I stood on his left, and he took hold of me and made me stand on his right.
Musnad Ahmad 2602Its isnad is saheeh, al-Bukhari (117) and Muslim (763)]