حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَبِشْرُ بْنُ مُعَاذٍ، قَالا: حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ زِيَادِ بْنِ عِلاقَةَ، عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ
قَالَ: صَلَّى رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، حَتَّى انْتَفَخَتْ قَدَمَاهُ، فَقِيلَ لَهُ: أَتَتَكَلَّفُ هَذَا، وَقَدْ غَفَرَ اللَّهُ لَكَ مَا تَقَدَّمَ مِنْ ذَنْبِكَ وَمَا تَأَخَّرَ؟ قَالَ: أَفَلا أَكُونُ عَبْدًا شَكُورًا
“The Messenger of Allah (sallallahu alayhi wa sallam) performed the ritual prayer until his feet became swollen, so he was asked: ‘Must you burden yourself with this, when Allah has already forgiven you your former and your latter sins?’ He replied: ‘Shall I not be a thankful servant?’”
Ash-Shama'il 252, Book 41, Worship And Devotion Of Rasoolullah, Hadith 1. 1 min read