Silsilat al-Ahadith al-Sahihah

Ziyad bin Husain narrates from his father Husain bin Qais that he came to Madinah with grain. He met the Messenger of Allah (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: "O Bedouin! What have you brought?" He said: "Wheat." The Prophet (peace and blessings be upon him) said: "What do you intend to do with it?" He said: "I want to sell it." Then the Bedouin said: The Prophet (peace and blessings be upon him) placed his hand on my head and said: "Deal with this Bedouin in buying and selling in a good manner."