Ja'far bin Muhammad narrates from his father that Sayyiduna Ali (may Allah be pleased with him) said: Whoever sells a slave who has property, the property belongs to the seller, unless the buyer stipulates (otherwise); the Prophet (peace and blessings be upon him) ruled this. And whoever sells pollinated palm trees, their fruit belongs to the seller, unless the buyer stipulates (otherwise).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10771