Hadith.4043 - Safwan ibn Yahya narrated from Abd al-Rahman ibn al-Hajjaj, who said: I asked Imam عليه السلام about currency exchange, and I said to Imam عليه السلام: "Sometimes during travel, the caravan may hurry, and we are unable to find the Damascene and Basran currencies. However, only the Damascene and Basran currencies are accepted in Nishapur. Imam عليه السلام asked: 'What is the caravan?' I said: 'It refers to a group of people who travel together and prepare for departure. If they hurry, they may not find the required currencies, so we sell them the lower-quality coins, exchanging 1,050 of these for 1,000 Damascene coins.' Imam عليه السلام said: 'There is no good in this. Why don't you add gold to it to account for the excess amount?'" I said to Imam عليه السلام: "Can I buy 1,000 and a dinar with 2,000 dirhams?" Imam عليه السلام said: "There is no harm in it. My father عليه السلام was bolder than us towards the people of Medina. He used to do this, and they would say it is merely a tactic. They would claim that if a man brought a dinar, he would not receive 1,000 dirhams, and if he brought 1,000 dirhams, he would not receive a dinar." Then Imam عليه السلام used to say: 'What an excellent thing it is to flee from the unlawful to the lawful.'"