SHAFAQNA – It is narrated from the Prophet of Islam (PBUH) who said: The one who enters trade must avoid 5 acts; usury, to swear, hiding the fault of goods, praising goods for selling (instead of introducing them as they actually are) and unjustified criticism of goods to buy [1, 2].
 Kafi, Vol. 5, page 150, Hadith Number 2.
 Man La Yahzarahul Faqih, Vol. 3, Page 120, Hadith Number 515.