Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever pollinates date palms and then sells his orchard, its fruit belongs to the first owner, unless the buyer makes it a condition."
(b) Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) ruled that whoever sells his slave who has wealth, that wealth belongs to the first owner, unless the buyer makes it a condition.
(c) Salim bin Abdullah (may Allah have mercy on him) narrates from his father concerning both the date palms and the slave.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10581