Sahih Muslim Book - 1, Hadith - 100

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدِ بْنِ جَمِيلِ بْنِ طَرِيفِ بْنِ عَبْدِ اللَّهِ الثَّقَفِيُّ عَنْ مَالِكِ بْنِ أَنَسٍ - فِيمَا قُرِئَ عَلَيْهِ - عَنْ أَبِي سُهَيْلٍ عَنْ أَبِيهِ أَنَّهُ سَمِعَ طَلْحَةَ بْنَ عُبَيْدِ اللَّهِ يَقُولُ: جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مِنْ أَهْلِ نَجْدٍ ثَائِرُ الرَّأْسِ نَسْمَعُ دَوِيَّ صَوْتِهِ وَلَا نَفْقَهُ مَا يَقُولُ حَتَّى دَنَا مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَإِذَا هُوَ يَسْأَلُ عَنْ الْإِسْلَامِ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ خَمْسُ صَلَوَاتٍ فِي الْيَوْمِ وَاللَّيْلَةِ فَقَالَ هَلْ عَلَيَّ غَيْرُهُنَّ؟ قَالَ لَا إِلَّا أَنْ تَطَّوَّعَ وَصِيَامُ شَهْرِ رَمَضَانَ فَقَالَ هَلْ عَلَيَّ غَيْرُهُ؟ فَقَالَ لَا إِلَّا أَنْ تَطَّوَّعَ وَذَكَرَ لَهُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الزَّكَاةَ فَقَالَ هَلْ عَلَيَّ غَيْرُهَا؟ قَالَ لَا إِلَّا أَنْ تَطَّوَّعَ قَالَ فَأَدْبَرَ الرَّجُلُ وَهُوَ يَقُولُ وَاللَّهِ لَا أَزِيدُ عَلَى هَذَا وَلَا أَنْقُصُ مِنْهُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَفْلَحَ إِنْ صَدَقَ.

It was narrated from Abu Suhail, from his father, that he heard Talhah bin 'Ubaidullah say: "A man from among the people of Najd, with disheveled hair, came to the Messenger of Allah (s.a.w), and we could hear the sound of his voice but we could not understand what he was saying, until he drew close to the Messenger of Allah (s.a.w), and he was asking about Islam. The Messenger of Allah (s.a.w) said: 'Five prayers each day and night.' He said: 'Do I have to offer any (prayers) other than that?' He said: 'No, unless you do them voluntarily. And fasting the month of Ramadan.' He said: 'Do I have to do any (fasting) other than that?' He said: 'No, unless you do it voluntarily.' And the Messenger of Allah (s.a.w) mentioned Zakat, and he said: 'Do I have to do anything other than that?' He said: 'No, unless you do it voluntarily.' The man left, saying: 'By Allah, I shall not do any more than this or any less.' The Messenger of Allah (s.a.w) said: 'He will succeed if he is telling the truth.'"