Sunan Ibn Majah Book 5, Hadith 1399

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 ‏"‏ ‏.‏

It was narrated that Anas bin Malik said:“The Messenger of Allah (ﷺ) 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.’”