Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) said that among the rulings of the Messenger of Allah (peace and blessings be upon him) is: "The fruit of the palm tree belongs to the one who pollinated it, unless the buyer stipulates (otherwise); and the property of a slave belongs to the one who sold him, unless the buyer stipulates (otherwise)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10772