Be careful when entering into any kind of agreement or contract; Abide by its terms once agreed upon; Be honest and fair in dealings with others; Do not take advantage or try manipulating others into something they do not want.

This hadith speaks about the binding nature of transactions. It is narrated from Ibn Juraij that Nafi dictated to him from Ibn 'Umar who said that the Messenger of Allah said that when two parties are involved in a transaction, they both have a choice until they separate. However, if both parties choose to conclude the transaction then it becomes binding and cannot be reversed. This hadith teaches us about how important it is for us to be careful when entering into any kind of agreement or contract as we must abide by its terms once we agree upon them. It also teaches us about being honest and fair in our dealings with others and not taking advantage of them or trying to manipulate them into something they do not want.