Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Sha'bi (may Allah have mercy on him) and Hazrat Hakam (may Allah have mercy on him) that two men jointly purchased an item; one bought half for twenty dirhams and the other bought half for ten dirhams. Hazrat Sha'bi (may Allah have mercy on him) says that if they sell this item on a murabaha basis, the profit will be according to the ratio of the capital, and if they sell the item on a musawamah basis, the profit will be divided equally. And Hazrat Hakam (may Allah have mercy on him) says that in both cases, the profit will be divided equally.