It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that Sayyiduna Abu Musa (may Allah be pleased with him) asked the Noble Prophet (peace and blessings be upon him) for a mount, but he found the Prophet (peace and blessings be upon him) busy, and the Prophet (peace and blessings be upon him) said: By Allah! I will not give you mounts. When he was about to leave, the Prophet (peace and blessings be upon him) called him back and gave him a mount. He said: O Messenger of Allah! You had sworn that you would not give me a mount? The Prophet (peace and blessings be upon him) said: Then I swear that I will certainly, certainly give you a mount.

Narrated by Sayyiduna Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever swears an oath about something, but later sees something else better, he should offer expiation for his oath and do what is better.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: When a man swears an oath regarding his family and pretends to be truthful (in his own view), then he will be a severe sinner in the sight of Allah Almighty, due to the expiation which Allah Almighty has commanded him.

(Second chain) The Messenger of Allah, peace and blessings be upon him, said: By Allah! When a man swears an oath regarding his family’s matter and (persists in using that oath as an excuse), then he is more sinful in the sight of Allah Almighty than if he were to fulfill the expiation (kaffarah) made obligatory by Allah Almighty.