It was narrated from Sharik bin ‘Abdullah bin Abu Namir that he heard Anas bin Malik say:
“While we were sitting in the mosque, a man entered riding a camel; he made it kneel in the mosque, then he hobbled it and said to them: ‘Which of you is Muhammad?’ The Messenger of Allah ﷺ was reclining among them, so they said: ‘This fair- skinned man who is reclining.’ The man said to him: ‘O son of ‘Abdul- Muttalib!’ The Prophet ﷺ said: ‘I am listening to you.’ The man said: O Muhammad! I am asking you and will be stern in asking, so do not bear any ill-feelings towards me.’ He said: ‘Ask whatever you think.’ The man said: ‘I adjure you by your Lord and the Lord of those who came before you, has Allah sent you to all of mankind?’ The Messenger of Allah ﷺ said: ‘By Allah, yes.; He said: ‘I adjure you by Allah, has Allah commanded you to pray the five prayers each day and night?’ The Messenger of Allah ﷺ said: ‘By Allah, yes.’ He said: ‘I adjure you by Allah, has Allah commanded you to fast this month of each year?’ The Messenger of Allah ﷺ said: ‘By Allah, yes.’ He said: ‘I adjure you by Allah, has Allah commanded you to take this charity from our rich and distribute it among our poor?’ The Messenger of Allah ﷺ said: ‘By Allah, yes.’ The man said: ‘I believe in what you have brought, and I am the envoy of my people who are behind me. I am Dimam bin Tha’labah, the brother of Banu Sa’d bin Bakr.’”

حَدَّثَنَا عِيسَى بْنُ حَمَّادٍ الْمِصْرِيُّ، أَنْبَأَنَا اللَّيْثُ بْنُ سَعْدٍ، عَنْ سَعِيدٍ الْمَقْبُرِيِّ، عَنْ شَرِيكِ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي نَمِرٍ، أَنَّهُ سَمِعَ أَنَسَ بْنَ مَالِكٍ، يَقُولُ بَيْنَمَا نَحْنُ جُلُوسٌ فِي الْمَسْجِدِ دَخَلَ رَجُلٌ عَلَى رَحْلٍ فَأَنَاخَهُ فِي الْمَسْجِدِ ثُمَّ عَقَلَهُ ثُمَّ قَالَ لَهُمْ أَيُّكُمْ مُحَمَّدٌ وَرَسُولُ اللَّهِ ﷺ مُتَّكِئٌ بَيْنَ ظَهْرَانَيْهِمْ . قَالَ فَقَالُوا هَذَا الرَّجُلُ الأَبْيَضُ الْمُتَّكِئُ . فَقَالَ لَهُ الرَّجُلُ يَا ابْنَ عَبْدِ الْمُطَّلِبِ . فَقَالَ لَهُ النَّبِيُّ ﷺ " قَدْ أَجَبْتُكَ " . فَقَالَ لَهُ الرَّجُلُ يَا مُحَمَّدُ إِنِّي سَائِلُكَ وَمُشَدِّدٌ عَلَيْكَ فِي الْمَسْأَلَةِ فَلاَ تَجِدَنَّ عَلَىَّ فِي نَفْسِكَ . فَقَالَ " سَلْ مَا بَدَا لَكَ " . قَالَ لَهُ الرَّجُلُ نَشَدْتُكَ بِرَبِّكَ وَرَبِّ مَنْ قَبْلَكَ آللَّهُ أَرْسَلَكَ إِلَى النَّاسِ كُلِّهِمْ فَقَالَ رَسُولُ اللَّهِ ﷺ " اللَّهُمَّ نَعَمْ " . قَالَ فَأَنْشُدُكَ بِاللَّهِ آللَّهُ أَمَرَكَ أَنْ تُصَلِّيَ الصَّلَوَاتِ الْخَمْسَ فِي الْيَوْمِ وَاللَّيْلَةِ قَالَ رَسُولُ اللَّهِ ﷺ " اللَّهُمَّ نَعَمْ " . قَالَ فَأَنْشُدُكَ بِاللَّهِ آللَّهُ أَمَرَكَ أَنْ تَصُومَ هَذَا الشَّهْرَ مِنَ السَّنَةِ فَقَالَ رَسُولُ اللَّهِ ﷺ " اللَّهُمَّ نَعَمْ " . قَالَ فَأَنْشُدُكَ بِاللَّهِ آللَّهُ أَمَرَكَ أَنْ تَأْخُذَ هَذِهِ الصَّدَقَةَ مِنْ أَغْنِيَائِنَا فَتَقْسِمَهَا عَلَى فُقَرَائِنَا فَقَالَ رَسُولُ اللَّهِ ﷺ " اللَّهُمَّ نَعَمْ " . فَقَالَ الرَّجُلُ آمَنْتُ بِمَا جِئْتَ بِهِ وَأَنَا رَسُولُ مَنْ وَرَائِي مِنْ قَوْمِي . وَأَنَا ضِمَامُ بْنُ ثَعْلَبَةَ أَخُو بَنِي سَعْدِ بْنِ بَكْرٍ .