It is narrated from Sayyiduna Abdullah bin Amr and Jabir (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: Whoever sells a slave who possesses wealth, then his wealth will belong to the seller, unless the buyer stipulates (otherwise). (And whoever grafts a date-palm and then sells it, the fruit will belong to him, unless the buyer stipulates that he is purchasing the tree along with its fruit.)