Abu Dawud Book 16, Hadith Number 3395.
Chapter : Not known.
Narated By Rafi’ ibn Khadij : Rafi’ had cultivated a land. The Prophet (PBUH) passed him when he was watering it. So he asked him: To whom does the crop belong, and to whom does the land belong? He replied: The crop is mine for my seed and labour. The half (of the crop) is mine and the half for so-and-so. He said: You conducted usurious transaction. Return the land to its owner and take your wages and cost.