Abu Musa asked permission to enter upon ʿUmar, but seeing that he was busy, he went away. ʿUmar then said, "Didn't I hear the voice of ʿAbdullah bin Qais? Allow him to come in." He was called in and ʿUmar said to him, "What made you do what you did." He replied, "We have been instructed thus by the Prophet" ʿUmar said, "Bring proof (witness) for this, other wise I will do so-and-so to you." Then ʿAbdullah bin Qais went to a gathering of the Ansar who then said, "None but the youngest of us will give the witness for it." So Abu Saʿid Al-Khudri got up and said, "We used to be instructed thus (by the Prophet)." ʿUmar said, "This tradition of the Prophet ﷺ remained hidden from me. Business in the market kept me busy."  

فَأْتِنِي عَلَى هَذَا بِبَيِّنَةٍ أَوْ لأَفْعَلَنَّ بِكَ فَانْطَلَقَ إِلَى مَجْلِسٍ مِنَ الأَنْصَارِ فَقَالُوا لاَ يَشْهَدُ إِلاَّ أَصَاغِرُنَا فَقَامَ أَبُو سَعِيدٍ الْخُدْرِيُّ فَقَالَ قَدْ كُنَّا نُؤْمَرُ بِهَذَا فَقَالَ عُمَرُ خَفِيَ عَلَىَّ هَذَا مِنْ أَمْرِ النَّبِيِّ ﷺ أَلْهَانِي الصَّفْقُ بِالأَسْوَاقِ  

Abu Huraira said, "You people claim that Abu Huraira narrates many narrations of Messenger of Allah ﷺ. (Anyhow) with Allah will be our appointment. I was a poor man, and used to stick to Messenger of Allah ﷺ contented with what will fill my stomach, and the Muhajirin (emigrants) used to be busy trading in the markets, and the Ansar used to be busy looking after their properties. One-day I heard Messenger of Allah ﷺ saying, 'Who will spread his Rida' (a garment covering the upper part of the body) till I finished my speech and then fold it, (i.e. wrap it over your body), in which case he will never forget anything he had heard from me." So I spread my garment which I was wearing; and by Him Who sent Muhammad with the Truth, ever since, I have never forgotten whatever I heard from him (the Prophet)" (See, Hadith No. 119, Vol. 1)  

أَنَّ أَبَا هُرَيْرَةَ يُكْثِرُ الْحَدِيثَ عَلَى رَسُولِ اللَّهِ ﷺ وَاللَّهُ الْمَوْعِدُ إِنِّي كُنْتُ امْرَأً مِسْكِينًا أَلْزَمُ رَسُولَ اللَّهِ ﷺ عَلَى مِلْءِ بَطْنِي وَكَانَ الْمُهَاجِرُونَ يَشْغَلُهُمُ الصَّفْقُ بِالأَسْوَاقِ وَكَانَتِ الأَنْصَارُ يَشْغَلُهُمُ الْقِيَامُ عَلَى أَمْوَالِهِمْ فَشَهِدْتُ مِنْ رَسُولِ اللَّهِ ﷺ ذَاتَ يَوْمٍ وَقَالَ مَنْ يَبْسُطْ رِدَاءَهُ حَتَّى أَقْضِيَ مَقَالَتِي ثُمَّ يَقْبِضْهُ فَلَنْ يَنْسَى شَيْئًا سَمِعَهُ مِنِّي فَبَسَطْتُ بُرْدَةً كَانَتْ عَلَىَّ فَوَالَّذِي بَعَثَهُ بِالْحَقِّ مَا نَسِيتُ شَيْئًا سَمِعْتُهُ مِنْهُ