Sunan Abi Dawud, Book 2, Hadith 391 (USC-MSA) ⓘ

Talhah b. 'Ubaid Allah said: A man from among the people of Najd with disheveled hair came to the Messenger of Allah. The humming sound of his voice could be heard but what he was saying could not be understood. He came closer and it was then known that he was asking about Islam. The Messenger of Allah said: Five times of prayer each day and night: He asked: Must I observe any more than them? He replied: No, unless you do it voluntarily. He (Talhah) said that the Messenger of Allah mentioned fasting during the month of Ramadan. He asked: Must I observe anything else? He replied: No, unless you do it voluntarily. The Messenger of Allah mentioned Zakat to him. He asked: Must I pay anything else? He replied: No, unless you do it voluntarily. The man then turned away saying: I swear by Allah, I shall not add anything to this or fall short of it. The Messenger of Allah said: The man will be successful if he speaks truth.

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ عَمِّهِ أَبِي سُهَيْلِ بْنِ مَالِكٍ، عَنْ أَبِيهِ، أَنَّهُ سَمِعَ طَلْحَةَ بْنَ عُبَيْدِ اللَّهِ، يَقُولُ جَاءَ رَجُلٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم مِنْ أَهْلِ نَجْدٍ ثَائِرَ الرَّأْسِ يُسْمَعُ دَوِيُّ صَوْتِهِ وَلاَ يُفْقَهُ مَا يَقُولُ حَتَّى دَنَا فَإِذَا هُوَ يَسْأَلُ عَنِ الإِسْلاَمِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ خَمْسُ صَلَوَاتٍ فِي الْيَوْمِ وَاللَّيْلَةِ ‏"‏ ‏.‏ قَالَ هَلْ عَلَىَّ غَيْرُهُنَّ قَالَ ‏"‏ لاَ إِلاَّ أَنْ تَطَّوَّعَ ‏"‏ ‏.‏ قَالَ وَذَكَرَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم صِيَامَ شَهْرِ رَمَضَانَ قَالَ هَلْ عَلَىَّ غَيْرُهُ قَالَ ‏"‏ لاَ إِلاَّ أَنْ تَطَّوَّعَ ‏"‏ ‏.‏ قَالَ وَذَكَرَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم الصَّدَقَةَ ‏.‏ قَالَ فَهَلْ عَلَىَّ غَيْرُهَا قَالَ ‏"‏ لاَ إِلاَّ أَنْ تَطَّوَّعَ ‏"‏ ‏.‏ فَأَدْبَرَ الرَّجُلُ وَهُوَ يَقُولُ وَاللَّهِ لاَ أَزِيدُ عَلَى هَذَا وَلاَ أَنْقُصُ ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَفْلَحَ إِنْ صَدَقَ ‏"‏ ‏.‏