Musannaf Ibn Abi Shayba 13:1238

Abu Bakr narrated to us, he said: Ibn Mahdi narrated to us, from Hammad ibn Salamah, from Hajjaj, he said: I asked Abu Bakr ibn Abi Musa about a man who sold an item to a man and said, "I am a partner in it." He said: He disliked this sale.