Volume 3, Book 47, Number 804:
Narrated ‘Umar bin Al-Khatab:
Once I gave a horse (for riding) in Allah’s Cause. Later I saw it being sold. I asked Allah’s Apostle
(whether I could buy it). He said, “Don’t buy it, for you should not get back what you have given in
charity.”
Volume 3 – 599 / 1700
SAHIH BUKHARI VOLUME 3 > BOOK 48: WITNESSES
Book 48: Witnesses