(36) باب فِي الْخَرْصِ
Narrated Aisha, Ummul Mu'minin:
The Prophet (ﷺ) used to send Abdullah ibn Rawahah (to Khaybar), and he would assess the amount of dates when they began to ripen before they were eaten (by the Jews). He would then give choice to the Jews that they have them (on their possession) by that assessment or could assign to them (Muslims) by that assignment, so that the (amount of) zakat could be calculated before the fruit became eatable and distributed (among the people).
Reference: Sunan Abi Dawud 3413
In-book reference: Book 23, Hadith 88
English translation: Book 22, Hadith 3406