Sahih Bukhari Volume 3, Book 52, Hadith 2679

حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ عَمِّهِ أَبِي سُهَيْلٍ، عَنْ أَبِيهِ، أَنَّهُ سَمِعَ طَلْحَةَ بْنَ عُبَيْدِ اللَّهِ، يَقُولُ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَإِذَا هُوَ يَسْأَلُهُ عَنِ الإِسْلاَمِ، فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ خَمْسُ صَلَوَاتٍ فِي الْيَوْمِ وَاللَّيْلَةِ ‏"‏‏.‏ فَقَالَ هَلْ عَلَىَّ غَيْرُهَا قَالَ ‏"‏ لاَ، إِلاَّ أَنْ تَطَّوَّعَ ‏"‏‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ وَصِيَامُ رَمَضَانَ ‏"‏‏.‏ قَالَ هَلْ عَلَىَّ غَيْرُهُ قَالَ ‏"‏ لاَ، إِلاَّ أَنْ تَطَّوَّعَ ‏"‏‏.‏ قَالَ وَذَكَرَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم الزَّكَاةَ‏.‏ قَالَ هَلْ عَلَىَّ غَيْرُهَا قَالَ ‏"‏ لاَ، إِلاَّ أَنْ تَطَّوَّعَ ‏"‏‏.‏ فَأَدْبَرَ الرَّجُلُ وَهْوَ يَقُولُ وَاللَّهِ لاَ أَزِيدُ عَلَى هَذَا وَلاَ أَنْقُصُ‏.‏ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَفْلَحَ إِنْ صَدَقَ ‏"‏‏.‏

Narrated By Talha bin 'Ubaidullah : A man came to Allah's Apostle asking him about Islam, Allah's Apostle said, "You have to offer five compulsory prayers in a day and a night (24 hours)." The man asked, "Is there any more compulsory prayers for me?" Allah's Apostle said, "No, unless you like to offer Nawafil (i.e. optional prayers)." Allah's Apostle then added, "You have to observe fasts during the month of Ramadan." The man said, "Am I to fast any other days?' Allah's Apostle said, "No, unless you wish to observe the optional fast voluntarily." Then Allah's Apostle told him about the compulsory Zakat. The man asked, "Do I have to give anything besides?" Allah's Apostle said, "No, unless you wish to give in charity voluntarily." So, the man departed saying, "By Allah I will neither do more nor less than that." Allah's Apostle said, "If he has said the truth he will be successful."