'A'isha reported:
We the family of Muhammad (ﷺ) used to spend (the whole) month in which we (did not need to) kindle the fire as (we had nothing to cook) ; we had only dates and water (to fill our bellies).
Reference: Sahih Muslim 2972 a
In-book reference: Book 55, Hadith 33
USC-MSA web (English) reference(deprecated numbering scheme): Book 42, Hadith 7089