When the prayer commences, there is no prayer but the obligatory one.
Sahih Muslim Book 6, Hadith 76
← Previous Hadith 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.

Sahih Muslim Book 6, Hadith 75 Next Hadith → A hadith like this has been reported by Ishaq with the same chain of transmitters.

Sahih Muslim Book 6, Hadith 77