Mukhtasar Sahih Bukhari — Hadith 1034

Sayyiduna Jabir (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) forbade selling fruits until they ripen, and that no type of them should be sold in exchange for anything except dirhams and dinars, except for ‘ariyah, for which it is permissible to sell them in exchange for fruits.