The prohibition of selling fresh dates in exchange for dry dates except in the case of 'Araya Sahih Muslim 1540 a
Translation
Bashair b. Yasir reported on the authority of some of the Companions of Allah's Messenger (ﷺ) among the members of his family among whom one was Sahl b. Abu Hathma that Allah's Messenger (ﷺ) forbade buying of fresh dates against dry dates and that it is Riba and this is Muzabana, but he made an exemption of 'ariyya (donations) of a tree or two in which case the members of a family sell dry dates and buy fresh dates for eating them.