Musannaf Ibn Abi Shayba 13:470

Abu Bakr narrated to us, he said: Jarir narrated to us, from Abd al-Aziz ibn Rufay’, from Muhammad ibn Ali ibn al-Hanafiyyah, he said: It was said to him: "Shall I sell one camel for two camels on credit?" He said: "No. But there is no harm in it if it is hand-to-hand (spot transaction)."