Musnad Ahmad 27:1091

Muhammad ibn Ja'far narrated to us, Mu'ammar narrated to us, al-Zuhri informed us, from Salim, from 'Abdullah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever sells date palms that have been pollinated, then their fruit belongs to the seller, unless the buyer stipulates otherwise. And whoever sells a slave who has wealth, then his wealth belongs to the seller, unless the buyer stipulates otherwise."