عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: فُرِضَ عَلَى نَبِيِّكُمْ خَمْسُونَ صَلَاةً، فَسَأَلَ رَبَّهُ عَزَّ وَجَلَّ فَجَعَلَهَا خَمْسًا
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him), he says: Fifty prayers were made obligatory upon your Prophet, then he asked his Lord, so He reduced them to five.