Narrated to us Abu Kurayb, Muhammad ibn al-'Ala', and Wasil ibn 'Abd al-A'la, both saying: narrated to us Ibn Fudayl, from his father, from Abu Zur'ah, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "Dates for dates, wheat for wheat, barley for barley, and salt for salt, equal for equal, hand to hand. Whoever increases or seeks an increase has engaged in usury, except when the colors differ."