Sunan Ibn Majah, Chapter: The Chapters of Establishing the Prayer and the Sunnah Regarding Them

"I asked Abu Saeed Al-Khudri about the prayer of the Messenger of Allah (saw). He said: 'There is nothing good in that for you.'* I said: 'Explain it, may Allah have mercy on you.' He said: 'The Iqamah would be given for the Zuhr prayer for the Messenger of Allah (saw), then one of us would go out to Al-Baqi, relieve himself, then come back and perform ablution, and he would find the Messenger of Allah (saw) still in the first Rakah of Zuhr.'" (Sahih) *Meaning, if you do not act upon it." See explanation by Sindi.