(54) باب حَقِّ الضَّيْفِ فِي الصَّوْمِ
Narrated `Abdullah bin `Amr bin Al-`As:
"Once Allah's Messenger (ﷺ) came to me," and then he narrated the whole narration, i.e. your guest has a right on you, and your wife has a right on you. I then asked about the fasting of David. The Prophet (ﷺ) replied, "Half of the year," (i.e. he used to fast on every alternate day).
Reference: Sahih al-Bukhari 1974
In-book reference: Book 30, Hadith 81
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 31, Hadith 195