(17) باب الرَّجُلِ يَكُونُ لَهُ مَمَرٌّ، أَوْ شِرْبٌ فِي حَائِطٍ أَوْ فِي نَخْلٍ
Narrated 'Abdullah (ra) said, I heard the Messenger of Allah (ﷺ) say "If somebody buys date-palms after they have been pollinated, the fruits will belong to the seller unless the buyer stipulates the contrary. If somebody buys a slave having some property, the property will belong to the seller unless the buyer stipulate that it should belong to him."
Reference: Sahih al-Bukhari 2379
In-book reference: Book 42, Hadith 27
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 40, Hadith 566