Anas said, “God's Messenger used to break his fast during a month so that we imagined he had not fasted during it at all, and he fasted so that we imagined he had not broken it. You did not wish to see him praying during the night without doing so, or sleeping without doing so.” Bukhari transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 1241
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه البخاري (1141)»