Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:

يا مَعشرَ التُّجّارِ، قَدِّموا الاسْتِخارةَ، وتَبرَّكوا بالسُّهولةِ، واقتَرِبوا مِن المُبْتاعِينَ، وتَزَيَّنوا بالحِلْمِ، وتَناهَوا عن اليَمينِ، وجانِبوا الكَذِبَ، وتَخافوا (تَجافَوا) عنِ الظُّلْمِ، وأنْصِفوا المظلومِينَ، ولا تَقْرَبوا الرِّبا، وأوْفُوا الكَيْلَ والمِيزانَ، ولا تَبْخَسوا النّاسَ أشياءهُم، ولاتَعْثَوا في الأرضِ مُفسدينَ.

'O merchants! Start off by seeking a good outcome from Allah, seek the blessing in easy conduct, draw near to customers, beautify yourselves with clemency, refrain from oaths, abandon lies, avoid wronging, be fair to those being wronged, stay away from usury, and "Observe fully the measure and the balance, with justice, and do not cheat the people of their goods, and do not act wickedly on the earth, causing corruption."

Source: Bihar al-Anwar, v. 78, p. 54, no. 100