Sunan An-Nasa'i

It was narrated from Talhah bin 'Ubaidullah that:a Bedouin came to the Messenger of Allah with unkempt hair and said: ""O Allah has enjoined upon me of Salah."" He said: ""The five daily prayers, unless you do any more voluntarily."" He said: ""Tell me what Allah has enjoined upon me voluntarily."" He said: ""Tell me what Allah has enjoined upon me of fasting."" He said: ""Fasting the month of Ramadan, unless you do any more voluntarily."" He said: ""Tell me what Allah has enjoined upon me of Zakah."" The Messenger of Allah told him of the laws of Islam, He said: ""By the One Who has honored you, I will not do anything voluntarily, and I will not do anything voluntarily, and I will not do less than that which Allah has enjoined upon, me: The Messenger of Allah said: ""He will succeed if he is sincere,"" or ""He will enter Paradise if he is sincere