عَنِ الْمُغِيرَةَ بْنِ شُعْبَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ قَامَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ حَتَّى تَوَرَّمَتْ قَدَمَاهُ فَقِيلَ يَا رَسُولَ اللَّهِ قَدْ غَفَرَ اللَّهُ لَكَ مَا تَقَدَّمَ مِنْ ذَنْبِكَ قَالَ أَوَلَا أَكُونُ عَبْدًا شَكُورًا
Sayyiduna Mughira bin Shu’bah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) would stand (in prayer) for such a long time that his feet would swell. Someone said: O Messenger of Allah! Indeed, Allah Almighty has forgiven your past sins. The Prophet (peace and blessings be upon him) replied: Should I not be a greatly thankful servant?