Hadith 5:941
Ghundar narrated to us, from Shu'bah, from Hammad, regarding a man upon whom a mandatory charity (zakat) became due from his camels, but he did not possess [the specific age/type required]. He said: He said, "They shall compensate each other for the difference between them."
حدثنا غندر عن شعبة عن حماد في رجل وجبت عليه فريضة في إبله لم تكن عنده قال فقال يترادان الفضل فيما بينهما