(38, 39) باب دِيَةِ الْمُكَاتَبِ
It was narrated that Ibn 'Abbas said:
"The Messenger of Allah ruled that the Diyah for a Mukatab who is killed should be (equivalent) to the Diyah for a free mand, proportionate to the amount be had paid off (toward buying his freedom)."
Reference: Sunan an-Nasa'i 4808
In-book reference: Book 45, Hadith 103
English translation: Vol. 5, Book 45, Hadith 4812