'Aishah (May Allah be pleased with her) reported:\n The Prophet (ﷺ) kept standing (in prayer) so long that the skin of his feet would crack. I asked him: "Why do you do this, while you have been forgiven of your former and latter sins?" He said, "Should I not be a grateful slave of Allah?"[Al-Bukhari and Muslim].\n

'Aishah (May Allah be pleased with her) reported:\n The Prophet (ﷺ) kept standing (in prayer) so long that the skin of his feet would crack. I asked him: "Why do you do this, while you have been forgiven of your former and latter sins?" He said, "Should I not be a grateful slave of Allah?"[Al-Bukhari and Muslim].\n

وعن عائشة رضي الله عنها، قالت‏:‏ كان النبي صلى الله عليه وسلم ، يقوم من الليل حتى تتفطر قدماه، فقلت له‏:‏ لم تصنع هذا يا رسول الله، وقد غفر لك ما تقدم من ذنبك وما تأخر‏؟‏ قال‏:‏ ‏\n"‏أفلا أكون عبدًا شكورًا‏"‏‏.‏ ‏(‏‏(‏متفق عليه وعن المغيرة بن شعبة نحوه، متفق عليه‏)‏‏)‏‏.‏