Sahih Muslim 7126

حَدَّثَنَا هَارُونُ بْنُ مَعْرُوفٍ وَهَارُونُ بْنُ سَعِيدٍ الْأَيْلِيُّ قَالَا حَدَّثَنَا ابْنُ وَهْبٍ أَخْبَرَنِي أَبُو صَخْرٍ عَنْ ابْنِ قُسَيْطٍ عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ عَنْ عَائِشَةَ قَالَتْ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا صَلَّى قَامَ حَتَّى تَفَطَّرَ رِجْلَاهُ قَالَتْ عَائِشَةُ يَا رَسُولَ اللَّهِ أَتَصْنَعُ هَذَا وَقَدْ غُفِرَ لَكَ مَا تَقَدَّمَ مِنْ ذَنْبِكَ وَمَا تَأَخَّرَ فَقَالَ يَا عَائِشَةُ أَفَلَا أَكُونُ عَبْدًا شَكُورًا

A'isha reported that when Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) occupied himself in prayer, he observed such a (long) qiyam (posture of standing in prayer) that his feet were swollen. A'isha said: Allah's Messenger you do this (in spite of the fact) that your earlier and later sins have been pardoned for you? Thereupon, he said. A'isha should I not prove myself to be a thanksgiving servant (of Allah)?