Musannaf Ibn Abi Shayba 13:3220

Abu Bakr narrated to us, he said: Ibn Abi Za'idah narrated to us, from 'Asim, he said: A man said to 'Amir: "I bought a horse and paid its price in cash, and I partnered with a man in it, then the horse died." He said: "Seek the reward for your horse [from Allah]."