Sahih Muslim 1649 g
Kitabu cha Viapo
It is recommended for the one who swears an oath then sees that something else is better than it; To do that which is better and offer expiation for his oath
Abu Musa al-Ash'ari reported: We came to Allah's Messenger (ﷺ) requesting him to provide us with riding camels. He (the Prophet) said: There is nothing with me with which I should equip you. By Allah, I would not provide you with (riding camels). Then Allah's Messenger (ﷺ) sent to us three camels with spotted bumps. We said: We came to Allah's Messenger (ﷺ) asking him to equip us with riding animals. He took an oath that he could not equip us. We came to him and informed him. He said: By Allah, I do not take an oath, but when I find the other thing better than that, I do that which is better.
Tafsiri ya Kiswahili ya hadithi hii bado haipatikani — inaonyeshwa kwa Kiingereza.