Be honest and fair with others while engaging in any kind of trade or business transaction; Be mindful of your words and actions at all times; Avoid any kind of dishonesty or deceitful behavior which could lead to negative consequences for yourself as well as those around you.

The hadith narrated by Ibn 'Umar tells us that the Prophet Muhammad ﷺ advised a man who was often cheated in buying to say "No cheating" when he buys something. This is an important lesson for all of us as it teaches us the importance of honesty and integrity in our business dealings. It also reminds us that we should always be aware of potential fraud or deception when engaging in any kind of trade or business transaction. We should always strive to be honest and fair with others so that we can maintain good relationships with them and ensure mutual trust and respect. Furthermore, this hadith also serves as a reminder for us to be mindful of our words and actions at all times so that we can avoid any kind of dishonesty or deceitful behavior which could lead to negative consequences for ourselves as well as those around us.