Imam Ar-Ridha’ (a.s.) said:
إنّا أَهْلُ بَيْت نَرَى وَعْدَنا عَلَيْنا دَيْناً كَما صَنَعَ رَسُولُ اللّهِ(ص)
We are the household who consider our promises as our debts; as did the Holy Prophet (peace be upon him and his progeny).1
Debt is not only what man receives from someone as a loan . Those who make promises to others in fact undertake an obligation and accept a responsibility and have an undeniable moral duty to make good on the promise.
fulfilling the promise indicates dignity, belief, greatness, honesty and truthfulness and strengthens mutual trust and confidence among people. It revives the spirit of social cooperation. For all these reasons , Islam strongly emphasizes the need to fulfill all promises.