(4) باب كَمْ فُرِضَتْ فِي الْيَوْمِ وَاللَّيْلَةِ .
It was narrated that Anas said:
"A man asked the Messenger of Allah (ﷺ): 'O Messenger of Allah, how many prayers has Allah enjoined upon His slaves?' He said: 'Allah has enjoined upon His slaves (five) prayers.' He said: 'O Messenger of Allah, is there anything before them or after them?' He said: 'Allah has enjoined upon His salves (five) prayers.' The man swore that he would not do anything more or less than that. The Messenger of Allah (ﷺ) said: 'If he is speaking the truth he will most certainly enter Paradise.'"
Reference: Sunan an-Nasa'i 459
In-book reference: Book 5, Hadith 12
English translation: Vol. 1, Book 5, Hadith 460