It is narrated from Sulaiman bin Yasar (may Allah have mercy on him) that the Messenger of Allah (ﷺ) used to send Abdullah bin Rawahah (may Allah be pleased with him), and he would make estimations and divide between you and the Jews.
Hadith Referenceمسند الإمام الشافعي / كتاب البيوع / 1473
Hadith Takhrijصحیح موصولا اخرجه البيهقي في المعرفة السنن والآثار (2318)۔