وَعَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا
قَالَ: بَيْنَا النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَخْطُبُ إِذا هُوَ بِرَجُل قَائِم فَسَأَلَهُ عَنْهُ فَقَالُوا: أَبُو إِسْرَائِيلَ نَذَرَ أَنْ يَقُومَ وَلَا يَقْعُدَ وَلَا يَسْتَظِلَّ وَلَا يَتَكَلَّمَ وَيَصُومَ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مُرُوهُ فَلْيَتَكَلَّمْ وَلْيَسْتَظِلَّ وَلْيَقْعُدْ وَلْيُتِمَّ صَوْمَهُ»
While the Prophet (sallallahu alayhi wa sallam) was preaching a man was standing, so he asked about him and was told that he was Abu Israil who had taken a vow to stand and not to sit, or go into the shade, or speak, but to fast. Thereupon the Prophet (sallallahu alayhi wa sallam) said, “Command him to speak, go into the shade, sit and complete his fast.”