"The Messenger of Allah ﷺ said: 'Allah, the Mighty and Sublime, enjoined fifty prayers upon my Ummah, and I came back with that until I passed by Musa, peace be upon him, who said: 'What has your Lord enjoined upon your Ummah?' I said: 'He has enjoined fifty prayers on them.' Musa said to me: 'Go back to your Lord, the Mighty and Sublime, for your Ummah will not be able to do that.' So I went back to my Lord, the Mighty and Sublime, and He reduced a portion of it. Then I came back to Musa and told him, and he said: 'Go back to you Lord, for your Ummah will not be able to do that.' So I went back to my Lord, the Mighty and Sublime, and He said: 'They are five (prayers) but they are fifty (in reward), and the Word that comes from Me cannot be changed.' [1] I came back to Musa and he said: 'Go back to your Lord.' I said: 'I feel too shy before my Lord, the Mighty and Sublime.'" [1]See Surah Qaf 50:29.  

قَالَ رَسُولُ اللَّهِ ﷺ فَرَضَ اللَّهُ ﷻ عَلَى أُمَّتِي خَمْسِينَ صَلاَةً فَرَجَعْتُ بِذَلِكَ حَتَّى أَمُرَّ بِمُوسَى عَلَيْهِ السَّلاَمُ فَقَالَ مَا فَرَضَ رَبُّكَ عَلَى أُمَّتِكَ قُلْتُ فَرَضَ عَلَيْهِمْ خَمْسِينَ صَلاَةً قَالَ لِي مُوسَى فَرَاجِعْ رَبَّكَ ﷻ فَإِنَّ أُمَّتَكَ لاَ تُطِيقُ ذَلِكَ فَرَاجَعْتُ رَبِّي ﷻ فَوَضَعَ شَطْرَهَا فَرَجَعْتُ إِلَى مُوسَى فَأَخْبَرْتُهُ فَقَالَ رَاجِعْ رَبَّكَ فَإِنَّ أُمَّتَكَ لاَ تُطِيقُ ذَلِكَ فَرَاجَعْتُ رَبِّي ﷻ فَقَالَ هِيَ خَمْسٌ وَهِيَ خَمْسُونَ لاَ يُبَدَّلُ الْقَوْلُ لَدَىَّ فَرَجَعْتُ إِلَى مُوسَى فَقَالَ رَاجِعْ رَبَّكَ فَقُلْتُ قَدِ اسْتَحْيَيْتُ مِنْ رَبِّي ﷻ  

[Machine] "The Messenger of Allah ﷺ said, 'The roof of my house was opened while I was in Makkah, and Gabriel ﷺ came down and opened my chest and washed it with Zamzam water. Then he brought a golden basin filled with wisdom and faith, and he poured it into my chest and closed it. Then he took me by the hand and ascended with me to the heavens.' The narration continued, 'Ibn Hazm and Anas said that the Messenger of Allah ﷺ said, 'Allah has obligated fifty prayers upon my Ummah (community). I returned with that until I passed by Moses, and he said, 'What has your Lord obligated upon your Ummah?' So I said, 'He has obligated upon them fifty prayers.' Moses said to me, 'Go back to your Lord and ask Him to reduce it, for your Ummah will not be able to bear that.' So I went back to my Lord and He reduced it by half. I returned to Moses and informed him, and he said, 'Go back to your Lord and ask Him to reduce it, for your Ummah will not be able to bear that.' So I went back to my Lord and He said, 'It is five (prayers),' and it remains as fifty in the sight of Allah.' I returned to Moses and he said, 'Go back to your Lord.' So I said, 'I feel too shy to ask my Lord.'"  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «فُرِجَ سَقْفُ بَيْتِي وَأنا بِمَكَّةَ فَنَزَلَ جِبْرِيلُ ﷺ فَفَرَجَ صَدْرِي ثُمَّ غَسَلَهُ مِنْ مَاءِ زَمْزَمَ ثُمَّ جَاءَ بِطَسْتٍ مِنْ ذَهَبٍ مُمْتَلِئٍ حِكْمَةً وَإِيمَانًا فَأَقَرَّهُ فِي صَدْرِي ثُمَّ أَطْبَقَهُ ثُمَّ أَخَذَ بِيَدِي ثُمَّ عَرَجَ بِي إِلَى السَّمَاءِ» وَسَاقَ الْحَدِيثَ وَقَالَ قَالَ ابْنُ حَزْمٍ وَأَنَسٌ قَالَ رَسُولُ اللهِ ﷺ فَرْضَ اللهُ عَلَى أُمَّتِي خَمْسِينَ صَلَاةً فَرَجَعْتُ بِذَلِكَ حَتَّى أَمُرَّ عَلَى مُوسَى فَقَالَ مُوسَى مَا فَرْضَ رَبُّكَ عَلَى أُمَّتِكَ؟ فَقُلْتُ فَرْضَ عَلَيْهِمْ خَمْسِينَ صَلَاةً قَالَ لِي مُوسَى فَرَاجِعْ رَبَّكَ فَإِنَّ أُمَّتَكَ لَا تُطِيقُ ذَلِكَ فَرَاجَعْتُ رَبِّي فَوَضَعَ شَطْرَهَا فَرَجَعْتُ إِلَى مُوسَى فَأَخْبَرْتُهُ فَقَالَ رَاجِعْ رَبَّكَ فَإِنَّ أُمَّتَكَ لَا تُطِيقُ ذَلِكَ فَرَاجَعْتُ رَبِّي فَقَالَ هِيَ خَمْسٌ وَهِيَ خَمْسُونَ لَا يُبَدَّلُ الْقَوْلُ لَدَيَّ فَرَجَعْتُ إِلَى مُوسَى فَقَالَ رَاجِعْ رَبَّكَ فَقُلْتُ قَدِ اسْتَحْيَيْتُ مِنْ رَبِّي