From Sahih Muslim (Hadith 3966):
Abdullah b. Umar (Allah be pleased with them) reported that Allah's Messenger (ﷺ) returned to the Jews of Khaibar the date-palms of Khaibar and its land on the condition that they should work upon them with their own wealth (seeds, implements), and give half of the yield to Allah's Messenger (ﷺ)
Reference: Muslim 3966