Volume 7, Book 71, Number 651:
Narrated Abu Huraira:
The Prophet said, “There is no Tiyara and the best omen is the Fal,” Somebody said, “What is the Fal,
O Allah’s Apostle?” He said, “A good word that one of you hears (and takes as a good omen).”
Volume 7 – 1285 / 1700
SAHIH BUKHARI VOLUME 7 > BOOK 71: MEDICINE