Sahih Bukhari

A man from Najd with unkempt hair came to Allah's Messenger (ﷺ) and we heardhis loud voice but could not understand what he was saying, till hecame near and then we came to know that he was asking about Islam.Allah's Messenger (ﷺ) said, "You have to offer prayers perfectly five timesin a day and night (24 hours)." The man asked, "Is there any more(praying)?" Allah's Messenger (ﷺ) replied, "No, but if you want to offer theNawafil prayers (you can)." Allah's Messenger (ﷺ) further said to him: "Youhave to observe fasts during the month of Ramadan." The man asked,"Is there any more fasting?" Allah's Messenger (ﷺ) replied, "No, but if youwant to observe the Nawafil fasts (you can.)" Then Allah's Messenger (ﷺ)further said to him, "You have to pay the Zakat (obligatory charity)."The man asked, "Is there any thing other than the Zakat for me topay?" Allah's Messenger (ﷺ) replied, "No, unless you want to give alms ofyour own." And then that man retreated saying, "By Allah! I willneither do less nor more than this." Allah's Messenger (ﷺ) said, "If what hesaid is true, then he will be successful (i.e. he will be grantedParadise)."