What does Islam say about keeping promises and fulfilling covenants?

Faithfulness to one's word is treated in Islam as a matter of religious integrity, not merely social courtesy. The Quran commands, "And fulfill the covenant. Indeed, the covenant will be questioned about" (17:34), meaning a person will be held accountable on the Day of Judgment for every promise made, whether to Allah, a spouse, a business partner, or a child. Believers are also told, "O you who believe, fulfill [all] contracts" (5:1), covering formal agreements as well as everyday assurances given casually in conversation. The Prophet made reliability a marker of true faith by listing its opposite among the signs of hypocrisy: "The signs of a hypocrite are three: when he speaks he lies, when he promises he breaks it, and when he is entrusted he betrays that trust" (Sahih al-Bukhari 33). This standard applies even to promises made to children — the Prophet taught that calling a child over with a false promise of a gift counts as a lie. Keeping one's word builds the trust that holds families, workplaces, and communities together, while habitual broken promises corrode it, which is why Islam treats reliability as inseparable from good character.

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