A man who grants a slave a manumission contract and stipulates his inheritance

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."

Adi wrote to Umar bin Abd al-Aziz (may Allah have mercy on him) that a man had made his slave a mukatab and had stipulated for himself a share of his inheritance. Umar wrote in reply: "No person is permitted to diminish anything of what Allah has made obligatory by setting a condition."

Ata was asked about a man who made his slave a mukatab, and his family stipulated: "A share of your inheritance will be ours." He said: "No! Allah Almighty's condition is established before their condition."

Something similar to the statement of Ata is reported from Ibrahim.