Liaison office of Grand Ayatullah Sayyid Ali Al Sistani (L.M.H.L) in London, Europe, North and South America.
Some things are considered recommended when buying and selling, including:
1. one should not discriminate between buyers with respect to the price of goods except when taking into account the buyer’s impoverished situation and suchlike;
2. at the start of business proceedings, one should say the shahādatayn (two testimonies), (258) and at the time of the transaction, one should say takbīr; (259)
3. one should give more of what is being sold and take less of what is being bought;
4. if the other party involved in the transaction regrets making the transaction and requests to annul (faskh) it, one should accept his request.