Sunan Ibn Majah, Volume 2, Book 5, Hadith 1399 (DarusSalam) ⓘ

It was narrated that Anas bin Malik said: “The Messenger of Allah said: ‘Allah enjoined fifty prayers upon my nation, and I came back with that until I came to Musa. Musa said: ‘What has your Lord enjoined upon your nation?’ I said: ‘He has enjoined fifty prayers on me.’ He said: ‘Go back to your Lord, for your nation will not be able to do that.’ So I went back to my Lord, and He reduced it by half. I went back to Musa and told him, and he said: ‘Go back to your Lord, for your nation will not be able to do that.’ So I went back to my Lord, and He said: ‘They are five and they are fifty; My Word does not change.’ So I went back to Musa and he said: ‘Go back to your Lord.’ I said: ‘I feel shy before my Lord.’”

حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى الْمِصْرِيُّ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ بْنُ يَزِيدَ، عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏ "‏ فَرَضَ اللَّهُ عَلَى أُمَّتِي خَمْسِينَ صَلاَةً فَرَجَعْتُ بِذَلِكَ ‏.‏ حَتَّى آتِيَ عَلَى مُوسَى فَقَالَ مُوسَى مَاذَا افْتَرَضَ رَبُّكَ عَلَى أُمَّتِكَ قُلْتُ فَرَضَ عَلَىَّ خَمْسِينَ صَلاَةً ‏.‏ قَالَ فَارْجِعْ إِلَى رَبِّكَ فَإِنَّ أُمَّتَكَ لاَ تُطِيقُ ذَلِكَ ‏.‏ فَرَاجَعْتُ رَبِّي فَوَضَعَ عَنِّي شَطْرَهَا فَرَجَعْتُ إِلَى مُوسَى فَأَخْبَرْتُهُ فَقَالَ ارْجِعْ إِلَى رَبِّكَ فَإِنَّ أُمَّتَكَ لاَ تُطِيقُ ذَلِكَ ‏.‏ فَرَاجَعْتُ رَبِّي فَقَالَ هِيَ خَمْسٌ وَهِيَ خَمْسُونَ لاَ يُبَدَّلُ الْقَوْلُ لَدَىَّ ‏.‏ فَرَجَعْتُ إِلَى مُوسَى فَقَالَ ارْجِعْ إِلَى رَبِّكَ ‏.‏ فَقُلْتُ قَدِ اسْتَحْيَيْتُ مِنْ رَبِّي ‏" ‏ ‏.‏