Abu al-Zubair says that I asked Sayyiduna Jabir (may Allah be pleased with him) what is the ruling if a man enters into a contract of alliance (mu'alaat) with someone else without his master's permission? He replied that the Prophet (peace and blessings be upon him) made it obligatory for every branch of the tribe to pay its share of blood money, and he also wrote that it is not permissible for anyone to enter into a contract of alliance with the slave of a Muslim man without his permission.