The Messenger of Allah ﷺ said, "Dates for dates, wheat for wheat, barley for barley, and salt for salt, like for like, hand to hand. Whoever gives more or asks for more has engaged in usury, except where the kinds differ." He did not mention "hand to hand."
و حدثنيه أبو سعيد الأشج حدثنا المحاربي عن فضيل بن غزوان بهذا الإسناد ولم يذكر يدا بيد