Musannaf Ibn Abi Shayba 13:3276

Abu Bakr narrated to us, he said: Abd al-Wahhab ibn Ata narrated to us, from Sa'id, from Qatadah, from Sa'id ibn al-Musayyib and Ibn Sirin, that they used to see no harm in a man giving money to another man as *mudarabah* (profit-sharing partnership) and saying: "You shall have one thousand dirhams of its profit."