Volume 3, Book 31, Number 195:
Narrated ‘Abdullah bin ‘Amr bin Al-‘As:
“Once Allah’s Apostle 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
replied, “Half of the year,” (i.e. he used to fast on every alternate day).
Volume 3 – 448 / 1700
SAHIH BUKHARI VOLUME 3 > BOOK 31: FASTING