(1) باب فَرْضِ الصَّلاَةِ وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ فِي إِسْنَادِ حَدِيثِ أَنَسِ بْنِ مَالِكٍ - رضى الله عنه - وَاخْتِلاَفِ أَلْفَاظِهِمْ فِيهِ .
Anas bin Malik and Ibn Hazm said:
"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.
Reference: Sunan an-Nasa'i 449
In-book reference: Book 5, Hadith 2
English translation: Vol. 1, Book 5, Hadith 450