Edustava hadith
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Imam Muslim : 1382و حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَأَبُو كُرَيْبٍ جَمِيعًا عَنْ ابْنِ فُضَيْلٍ قَالَ أَبُو بَكْرٍ حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ عَنْ مُخْتَارِ بْنِ فُلْفُلٍ قَالَ سَأَلْتُ أَنَسَ بْنَ مَالِكٍ عَنْ التَّطَوُّعِ بَعْدَ الْعَصْرِ فَقَالَ كَانَ عُمَرُ يَضْرِبُ الْأَيْدِي عَلَى صَلَاةٍ بَعْدَ الْعَصْرِ وَكُنَّا نُصَلِّي عَلَى عَهْدِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ رَكْعَتَيْنِ بَعْدَ غُرُوبِ الشَّمْسِ قَبْلَ صَلَاةِ الْمَغْرِبِ فَقُلْتُ لَهُ أَكَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَلَّاهُمَا قَالَ كَانَ يَرَانَا نُصَلِّيهِمَا فَلَمْ يَأْمُرْنَا وَلَمْ يَنْهَنَا
And Narrated to us by [Abu Bakar bin Abu Syaibah] and [Abu Kuraib] all from [Ibn Fudlail], [Abu Bakar] said, [Muhammad bin Fudlail] narrated to us from [Mukhtar bin Fulful] he said, I asked [Anas bin Malik] about the voluntary prayer after the Asr prayer. So he replied, 'Umar used to strike someone's hand for praying after Asr. And during the time of the Messenger of Allah, peace and blessings be upon him, we used to perform two rak'ahs after the sun set and before the Maghrib prayer.' I asked him again, 'Did the Messenger of Allah, peace and blessings be upon him, ever do it?' He replied, 'He saw us doing it, but he did not command us nor forbid it.'