Nafie' نافع مولى ابن عمر · The Chapters on Expiation

"The swearing of the Messenger of Allah (ﷺ) was: 'No, and I ask Allah for forgiveness."'

the Messenger of Allah (ﷺ) said: 'Do not take oaths by idols nor by your forefathers. "

"Whoever takes an oath to cut off the ties of kinship, or to do something that is not right, the fulfillment of his vow is not to do that."

"Whoever swears an oath then sees that something else is better than it, let him not do it, and his leaving it is the expiation for it. "

"The Messenger of Allah (ﷺ) offered expiation of a Sa' of dates, and he enjoined the people to do likewise. Whoever does not have that (must give) half a Sa' of wheat."