SHAFAQNA – It is narrated from Imam Kazim (AS) who said: The one who always swears at the time buying or selling, on the Day of Judgment Allah (SWT) will not look at him compassionately . Imam Ali (AS) also said: Do not swear in dealings and transactions, although it may sell the goods but will take away the blessings .
 Kafi, Vol. 5, Page 162, Hadith Number 3.
 As above, hadith Number 4.