Buying and Selling: Recommended Acts When Buying and Selling
Practical Laws of Islam as per the teachings of Ayatullah Sistani
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),[1] and at the time of the transaction, one should say takbīr;[2]
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.
-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling
That is, testifying to the oneness of Allah and the prophethood of Prophet Muḥammad (Ṣ).
Takbīr is a proclamation of Allah’s greatness by saying ‘allāhu akbar’.