The prohibition of selling fresh dates in exchange for dry dates except in the case of 'Araya Sahih Muslim 1542 b
Translation
'Abdullah (b. Umar) reported that Allah's Apostle (ﷺ) forbade Muzabana, i. e. buying of fresh dates (on) the trees for dry dates by measure, and the buying of grapes for raisins by measure and the selling of field of corn for corn by measure.