It was narrated from Ibn 'Umar that the Messenger of Allah (ﷺ) said:
"Whoever buys a palm tree that has been pollinated, its fruits belong to the seller, unless the purchaser stipulated a condition." (Sahih)Another chain from Ibn 'Umar, from the Prophet (ﷺ), with similar wording.
English reference: Vol. 3, Book 12, Hadith 2210
Arabic reference: Book 12, Hadith 2294