Hadith 1187
Sayyiduna Ibn Abbas (may Allah be pleased with them) narrates that the Prophet (peace and blessings be upon him) said: "The blood money (diyah) of a mukatab (a slave with a contract of manumission) will be equal to that of a free man in proportion to how much he has become free, and in proportion to how much he remains a slave, his blood money will be that of a slave."