Be honest and trustworthy when conducting business with others; be mindful of your words and actions so as not to deceive or harm anyone else; take steps to protect yourself against potential deception or dishonesty during transactions.

This hadith is about protecting oneself when engaging in business transactions. The Prophet Muhammad (PBUH) advised a man who was often cheated in his business dealings to say "No trickery" whenever he entered into a transaction. This phrase serves as an important reminder that one should be aware of any potential deception or dishonesty that may occur during the course of the transaction and take steps to protect themselves against it. It also teaches us the importance of being honest and trustworthy when conducting business with others. Furthermore, it encourages us to be mindful of our words and actions so as not to deceive or harm anyone else in our dealings with them.