Chosen Islamic Manners

'O owner of this food, what is this?' The owner said: 'O Messenger of Allah () the fruit was dampened by rain.' He said: 'You should have placed the dampened food on top so that people can see it. Whoever cheats is not from us!' (Tirmidthi)
*It is unlawful for one to meet merchants before they enter the market area. The Prophet () said:

'Do not buy products till they reach the marketplace.'

(Saheeh al-Jami)
*It is not lawful for one to sell what they do not own, or do not possess.

*One should be kind and forbearing when selling and buying. The Prophet () said:

'May Allah have mercy on one who is kind and forbearing when buying, selling and when asking for the repayment of his loan.' (Ibn Majah)
*One should not raise his voice when arguing. The Prophet () was neither ill-mannered nor rude, nor did he raise his voice. He did not pay evil with evil; rather, he forgave and pardoned. (Shama’il Muhamadiyyah)
*One should abide by his promises and duties. Allah, the Exalted, says:

O you who have believed, fulfill all contracts.(5:1)

*One should verify sales by noting them down or having them attested. Allah, the Exalted, says:

But take witnesses whenever you make a commercial contract. (2:282)

*One should not excessively swear by Allah when buying or selling. The Prophet () said:

'Beware, do not excessively swear by Allah when buying or selling, for it will lead one to hypocrisy and remove the blessings of one's product.' (Saheeh at-Targheeb)