Muwatta Malik · Hadith 1477
حدثني مالك، عن هشام بن عروة، عن ابيه، عن عايشة، زوج النبي صلى الله عليه وسلم ان رسول الله صلى الله عليه وسلم سيل عن الرقاب ايها افضل فقال رسول الله صلى الله عليه وسلم " اغلاها ثمنا وانفسها عند اهلها
Malik related to me from Hisham ibn Urwa from his father from A'isha, the wife of the Prophet, may Allah bless him and grant him peace, that the Messenger of Allah, may Allah bless him and grant him peace, was asked what was the most excellent kind of slave to free. The Messenger of Allah, May Allah bless him and grant him peace, answered, "The most expensive and the most valuable to his master
Sahih · Salim al-Hilali