Amr bin Dinar narrates: Ibn Umar (may Allah be pleased with them both) was asked about a man who said to another man: Sell me the fruit of your land for the same quantity that you measure from it. Ibn Umar (may Allah be pleased with them both) said: "The Messenger of Allah (peace and blessings be upon him) forbade this, and it is muzabanah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13595