He greeted the Messenger of Allah ﷺ while he was praying, and he returned the greeting.
أخبرنا محمد بن بشار قال حدثنا وهب يعني ابن جرير قال حدثنا أبي عن قيس بن سعد عن عطاء عن محمد بن علي
أنه سلم على رسول الله ﷺ وهو يصلي فرد عليه
No references are available.
[Its chain is sahih] Ahmad narrated it: 4/263, from the hadith of Muhammad bin Ali bin Abu Talib, who is Ibn Hanafiya, through this same route, and it is also in al-Kubra, hadith no. 1111.