Musannaf Ibn Abi Shaybah 23586 — A man who grants a slave

It is narrated from Muhammad (may Allah have mercy on him) that a man made his slave a mukatab and stipulated for himself the slave's wala', inheritance and house. When the slave paid the amount of his mukatabah he became free, and then he died. After his death, his relatives disputed about the inheritance, and Shurayh (may Allah have mercy on him) declared that stipulation void. The slave's master said: "What benefit have I had from the condition I set twenty years ago?" Shurayh said: "Allah's condition has stood for fifty years before you, and it has the greater right."