Musannaf Ibn Abi Shayba 13:2072

Abu Bakr narrated to us, he said: Ibn ‘Uyaynah narrated to us, from Yazid ibn Yazid ibn Jabir, from Isma’il ibn ‘Ubayd Allah, from ‘Abd al-Rahman ibn Ghanam, he said: ‘Umar said: "The boundaries of rights are according to the conditions."