Abdullah bin Ubayd bin Umayr (may Allah have mercy on him) narrates concerning the settlement of the Prophet (peace and blessings be upon him) with the Jews of Khaybar, that half of the fruit would be ours and half yours, and you would take on the work. Then, when their fruit had ripened, they came to the Prophet (peace and blessings be upon him) and said: "Our fruit has ripened, so send an estimator to make the estimate between us and you." So the Prophet (peace and blessings be upon him) sent Sayyiduna Abdullah bin Rawahah (may Allah be pleased with him). When he had gone around their date palms and looked, he said: "By Allah, I know of no one among the creation of Allah who fabricates greater lies against Allah or is more hostile to the Messenger of Allah (peace and blessings be upon him) than you. By Allah, Allah has not created anyone more hateful to me than you. (Yet) by Allah, this will never lead me to wrong you by even the weight of a speck, knowingly." The narrator says: Then he estimated the entire (produce), what belonged to the Muslims and what belonged to the Jews, at eighty thousand wasq. The Jews said: "You have given us the choice (to take our share or to hand it over)?" Sayyiduna Ibn Rawahah (may Allah be pleased with him) said: "If you wish, give us forty thousand wasq and (take your share and) part from us." They looked at one another, then said: "By this (justice) the heavens and the earth stand, and because of it they (the Muslims) prevail over you."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14019