Volume 3, Book 31, Number 147:
Narrated Salama bin Al-Akwa:
Once the Prophet ordered a person on ‘Ashura’ (the tenth of Muharram) to announce, “Whoever
has eaten, should not eat any more, but fast, and who has not eaten should not eat, but complete his
fast (till the end of the day).
Volume 3 – 438 / 1700
SAHIH BUKHARI VOLUME 3 > BOOK 31: FASTING