Abu Huraira reported the Messenger of Allah (ﷺ) as saying:When the prayer commences then there is no prayer (valid), but the obligatory prayer. This hadith has been narrated by Warqa' with the same chain of transmitters

Abu Huraira reported the Messenger of Allah (ﷺ) as saying:When the prayer commences, there is no prayer but the obligatory one

A hadith like this has been reported by Ishaq with the same chain of transmitters

This hadith has been narrated by Abu Huraira with another chain of transmitters. Hammad (one of the narrators) said:I then met 'Amr (the other narrator) and he narrated it to me, but it was not transmitted directly from the Messenger of Allah (ﷺ)