[Machine] I heard Ibn Abbas saying, "I prayed eight raka'at with the Prophet ﷺ , and seven raka'at with Ali." Sufyan narrated to us from Abu Zubair, from Sa'id bin Jubair, from Ibn Abbas, who said the same. So I asked Ibn Abbas, "Why did he do that?" He said, "He wanted to lighten the burden on his Ummah." Sufyan added in another narration from Abu Zubair, without fear or travel.  

سَمِعْتُ ابْنَ عَبَّاسٍ ؓ يَقُولُ صَلَّيْتُ مَعَ النَّبِيِّ ﷺ ثَمَانِيَ جَمِيعًا وَسَبْعًا جَمِيعًا وَقَالَ عَلِيٌّ وَحَدَّثَنَا بِهِ سُفْيَانُ عَنْ أَبِي الزُّبَيْرِ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عَبَّاسٍ مِثْلَهُ فَقُلْتُ لِابْنِ عَبَّاسٍ لِمَ فَعَلَ ذَلِكَ؟ قَالَ أَرَادَ أَنْ لَا يُحْرِجَ أُمَّتَهُ وَزَادَ سُفْيَانُ مَرَّةً فِي حَدِيثِ أَبِي الزُّبَيْرِ فِي غَيْرِ خَوْفٍ وَلَا سَفَرٍ