Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) cultivated a piece of land, and the Prophet (peace and blessings be upon him) passed by him while he was watering it. He (peace and blessings be upon him) said: "Whose is the crop, and whose is the land?" He said: The crop is mine, by my own hands and labour; half the share is mine and half belongs to so-and-so's people. He (peace and blessings be upon him) said: "You have engaged in usury (riba). Return the land to its owners and take your expenses."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4428