that Imam 'Ali (AS) used to come to the market and exhort, ?O Market traders, fear Allah and beware of making false oaths, for though it may sell your goods, it eradicates all benediction thereof. The trader [by nature] is corrupt, except those who take only their right, and give back the right due, and upon you be peace.' Then a few days would pass, and he would come there again and exhort them as he did before.'