“The Messenger of Allah ﷺ used to pray until his feet became swollen. It was said: ‘O Messenger of Allah, Allah has forgiven you your past and future sins.’ He said: ‘Should I not be a thankful slave?’”
كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي حَتَّى تَوَرَّمَتْ قَدَمَاهُ فَقِيلَ لَهُ إِنَّ اللَّهَ قَدْ غَفَرَ لَكَ مَا تَقَدَّمَ مِنْ ذَنْبِكَ وَمَا تَأَخَّرَ قَالَ أَفَلاَ أَكُونُ عَبْدًا شَكُورًا