يَا أَيُّهَا الَّذِينَ آمَنُوا أَوْفُوا بِالْعُقُودِ
O you who believe! Fulfill (your) obligations
Imaam Sadi (rahimahullaah) stated that this is a command from Allaah (The Most High) to His believing slaves (regarding) what Eemaan necessitates (in relation) to fulfilling obligations – fulfilling and completing obligations and neither breaking them nor falling short (in fulfilling them).
This (command) covers all obligations between a slave and His Lord, by adhering and fulfilling the (rights) of servitude Allaah and establishing it perfectly, without reducing anything from it. [Likewise, this command includes one’s obligations] towards the Messenger, by obeying and following him; (one’s obligations) towards parents and relatives, by being dutiful to them and not to sever the ties of kinship; (one’s obligations) towards his companions, by fulfilling the rights of companionship in times of richness and poverty, and in times of ease and hardship; (one’s obligations) towards the creation with regards to agreements in dealings, such as business transactions, rental agreements and what is similar to them….
[For further details see Tayseer Al-Kareem Ar-Rahmaan Fee Tafseer Kalaam Al-Mannaan]