Yahya bin Abi Ishaq said: I asked Qasim bin Abdur Rahman and Muawiyah bin Qurrah about the will of a man who says, "All my slaves are free," and one of his slaves is a runaway. Both of them replied that he too will be free. And Hasan, Iyās, and Bakr bin Abdullah said: He will not be free.
Hadith Referenceسنن دارمي / من كتاب الوصايا / 3328