Musannaf Ibn Abi Shayba 13:1280

Abu Bakr narrated to us, he said: Al-Fadl ibn Dukayn narrated to us, from Ibn ‘Amir, from ‘Abd al-Rahman ibn al-Aswad, he said: I used to engage in sharecropping for a third or a quarter, and I would bring it to ‘Alqamah and al-Aswad. If they had seen any harm in it, they would have forbidden me from it.