Al-Aswad bin Qays (may Allah have mercy on him) narrates from his father (may Allah have mercy on him) that he said: When we reached the people of al-Hirah, we made a treaty with them for one thousand dirhams and a mount. He said: I said to my father: What did you do with that mount? He said: (It was for) a companion of ours who had no mount. This is how it is in my book: one thousand dirhams; others said: seventy thousand dirhams.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18362