What is the ruling on some sellers saying “prayers upon the Prophet”

Question : There is another point. This questioner, Muhammad Abdullah, says: Some sellers, when a customer is haggling over the price of goods, the seller says to him, “By the prayers upon the Prophet (peace and blessings be upon him),”

Answer : We do not know what he means by “by the prayers upon the Prophet,” but it has become customary for the broker who sells to begin by saying, “Prayers upon the Messenger, prayers upon the Messenger.” This has no basis in the Shari'ah, so it is not appropriate to say “prayers upon the Messenger” when displaying