The verse in question (Q.5:1) from the Quran states "O you who have believed, fulfill [all] contracts." This verse requires believers to fulfill all their obligations and agreements they make with others. It emphasizes the importance of honesty and fulfilling promises, which is an essential part of Islamic ethics. In Islam, keeping one's word and fulfilling promises is highly valued, and breaking a promise is considered a serious sin. Therefore, this verse reminds believers to be truthful and trustworthy in all their dealings and to fulfill their commitments to others.
