On forbidding continuous fasting, which is to fast two or more days without eating or drinking between them

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

346. Chapter: On forbidding continuous fasting, which is to fast two or more days without eating or drinking between them

1764. Abu Hurayra and 'A'isha reported that the Messenger of Allah, may Allah bless him and grant him peace, forbade continuous fasting. [Agreed upon]

1765. Ibn 'Umar said, "The Messenger of Allah, may Allah bless him and grant him peace, forbade continuous fasting. They said, 'But you fast continuously.' He said, 'I am not like you. I am fed and given to drink.'" [Agreed upon]