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.
عَنِ النَّبِيِّ ﷺ قَالَ إِذَا أُقِيمَتِ الصَّلاَةُ فَلاَ صَلاَةَ إِلاَّ الْمَكْتُوبَةُ وَحَدَّثَنِيهِ مُحَمَّدُ بْنُ حَاتِمٍ وَابْنُ رَافِعٍ قَالاَ حَدَّثَنَا شَبَابَةُ حَدَّثَنِي وَرْقَاءُ بِهَذَا الإِسْنَادِ
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