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:‏ ‏"‏أفلا أكون عبدًا شكورًا‏"‏‏.‏ ‏(‏‏(‏متفق عليه وعن المغيرة بن شعبة نحوه، متفق عليه‏)‏‏)‏‏.‏

Anas (May Allah be pleased with him) reported

The Messenger of Allah (ﷺ) used to leave off observing Saum (fasting) during a month until we thought that he would not observe Saum at all during it; and (sometimes) he would observe Saum till we began to think that he would not omit any day of that month. If one wished to see him performing Salat during the night, he could do that; and if one wished to see him sleeping at night, he could do that.[Al- Bukhari].