Musannaf Ibn Abi Shayba 18:721

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Ali ibn Abi Talha, from al-Qasim ibn Abd al-Rahman, he said: Abdullah said: Whoever has a covenant or a protection, his blood money is the blood money of a free Muslim.