Sunan an-Nasai Book 47, Hadith 5028

أَخْبَرَنَا مُحَمَّدُ بْنُ سَلَمَةَ قَالَ حَدَّثَنَا ابْنُ الْقَاسِمِ عَنْ مَالِكٍ قَالَ حَدَّثَنِي أَبُو سُهَيْلٍ عَنْ أَبِيهِ أَنَّهُ سَمِعَ طَلْحَةَ بْنَ عُبَيْدِ اللَّهِ يَقُولُ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مِنْ أَهْلِ نَجْدٍ ثَائِرَ الرَّأْسِ يُسْمَعُ دَوِيُّ صَوْتِهِ وَلَا يُفْهَمُ مَا يَقُولُ حَتَّى دَنَا فَإِذَا هُوَ يَسْأَلُ عَنْ الْإِسْلَامِ قَالَ لَهُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ خَمْسُ صَلَوَاتٍ فِي الْيَوْمِ وَاللَّيْلَةِ قَالَ هَلْ عَلَيَّ غَيْرُهُنَّ قَالَ لَا إِلَّا أَنْ تَطَوَّعَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَصِيَامُ شَهْرِ رَمَضَانَ قَالَ هَلْ عَلَيَّ غَيْرُهُ قَالَ لَا إِلَّا أَنْ تَطَوَّعَ وَذَكَرَ لَهُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الزَّكَاةَ فَقَالَ هَلْ عَلَيَّ غَيْرُهَا قَالَ لَا إِلَّا أَنْ تَطَوَّعَ فَأَدْبَرَ الرَّجُلُ وَهُوَ يَقُولُ لَا أَزِيدُ عَلَى هَذَا وَلَا أَنْقُصُ مِنْهُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَفْلَحَ إِنْ صَدَقَ

Abu Suhail narrated from his father,:That he heard Talhah bin 'Ubaidullah say: "A man from Najd with unkempt hair came to the Messenger of Allah [SAW]; he was speaking loudly but his speech could not be understood until he came close. He was asking about Islam. The Messenger of Allah [SAW] said: 'Five prayers every day and night.' He said: 'Do I have to do any more than that? He said: 'No, not unless you do it voluntarily.' The Messenger of Allah [SAW] said: 'Fasting the month of Ramadan.' He said: 'Do I have to do any more than that?' He said: 'No, not unless you do it voluntarily.' Then the Messenger of Allah [SAW] told him about Zakah. He said: 'Do I have to do any more than that?' He said: 'No, not unless you do it voluntarily.' The man left saying, 'I will not do any more than that or any less.' The Messenger of Allah [SAW] said: 'He will succeed, if he is telling the truth