It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "The blood money of a mukatab (slave) will be paid according to the proportion of his freedom at the rate of a free (person), and for the portion of slavery that remains, the reckoning will be according to that of a slave." This hadith is sahih (authentic) on the condition of Imam Bukhari, but the two Shaykhs (Bukhari and Muslim) did not record it.