Swearing at the Time of Buying and Selling

4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn Tsa from Muhammad ibn al-Hassan Za’lan from abu Tsma’il; in a marfu’ manner’ has said, the following: “Amir al-Mu’minin عليه السلام, would say, ‘Beware of swearing; it may make a merchandise easily sell, but it destroys the blessings.’”