Sahih Muslim 3790

Jabir b. Abdullah (Allah be pleased with them) reported that Allah's Apostle (ﷺ) made it obligatory for every tribe (the payment) of blood-wit; he then also made it explicit that it is not permissible for a Muslim to make himself the ally (of the slave emancipated by another) Muslim without his permission. He (the narrator further added):I was informed that he (the Holy Prophet) cursed the one who did that (and it was recorded) in his Sahifa (in a document)