It is very important to be truthful and to keep promises. Nobody believes a liar, and no one likes to trust a person who breaks his promises.
Allah the Almighty says, “O you who have believed, fulfill [all] contracts.
The obligations this verse speaks of include promises, covenants and oaths.
“Then let them end their untidiness and fulfill their vows”
“And fulfill the covenant of Allah when you have taken it, [O believers], and do not break oaths after their confirmation while you have made Allah , over you, a witness.”
Allah Most High is true to His Promise,
“Indeed, Allah does not fail in His promise.”
“And who is truer to his covenant than Allah?”
A believer’s word, therefore, is a bond. A Muslim must keep his promise. Whatever promise he makes, whatever word he gives, and whatever agreement into which he enters, he should abide by it faithfully and sincerely. An ocean may change its course, a mountain may move its place, but a Muslim should not fail to fulfill his promise.
Allah’s Messenger (pbuh) hated lies. He was prepared to accept misers and cowards as believers but he refused to regard a liar as a true Muslim. Liars were classed in the same category as promise-breakers and hypocrites.
Al-Bukhaaree relates on the authority of Ibn Mas’ood that the Prophet (pbuh) said, “On the Day of Judgment, every deceitful man will bear a banner, and it will be said, ‘Behold the deceit of so-and-so!”
The Prophet (pbuh) also said, “Whoever possesses these four [characteristics] will be a pure hypocrite; and whoever possesses one of them characteristics of hypocrisy until he gives it up: When he is entrusted with something, he betrays the trust; when he speaks, he tells a lie; when he makes a covenant, he proves treacherous; and when he quarrels, he uses foul language.” (Al-Bukhaaree and Muslim)
The Prophet (pbuh) also said, “Give what you hold in trust back to the person who has entrusted you with it, and do not betray anyone, even if he has betrayed you.” (At-Tirmidhee)
Hence, be truthful and keep your promises. If you tell your mother that you will be back from the game at ten o’clock, be home on time! If you offer to clean the garage for your father, do the job and keep working until you finish it.
When your parents see from all these kinds of little acts that you are developing a sense of responsibility and that you can be trusted, they will be willing to give you some of the privileges you are asking for.
It is easy to see, then, why keeping promises makes you bigger than yourself, older than your age. Keeping promises is truly a personality building characteristic.