Bulugh al-Maram #1084

Narrated 'Umar (RA): I provided a man with a horse to ride in Allah's Cause, but as he did not look after it well, I thought he would sell it at a cheap price. I therefore asked Allah's Messenger (ﷺ) about that and he said, "Do not buy it even if he gives it to you for a Dirham..." The narrator reported the rest of the Hadith. .