Sahl ibn Abu Hathmah came to our gathering. He said: The Messenger of Allah (ﷺ) commanding us said: When you estimate take them leaving a third, and if you do not leave or find a third, leave a quarter.
Sunan Abi Dawud Book 9, Hadith 50
← Previous Hadith The Above-mentioned tradition has also been narrated by Ibn Shihab through a different chain of narrators to the same effects.

Sunan Abi Dawud Book 9, Hadith 49 Next Hadith → Describing the conquest of Khaybar Aisha said: The Prophet (ﷺ) used to send Abdullah ibn Rawahah to the Jews of Khaybar, and he would make an estimate of the palm trees when the fruit was in good condition before any of it was eaten.

Sunan Abi Dawud Book 9, Hadith 51