A vow to do something that Allah has made obligatory and enjoined upon people is not valid

A Catholic woman promised Allah that she would not get married if Allah forgave her sins, then she became Muslim

She swore that she would not speak to her and she sent her a text message; has she broken her oath?

Ruling on one who swears about something based on what he thinks is likely to be the case, then it turns out to be otherwise

Her mother died and she had vowed to sacrifice a sheep; can her daughter give the cash value instead?

Can You Swear by the Quran?

Taking Serious Oaths While Being Affected by Insinuating Whispers

If a person fasts in expiation for breaking an oath, does he have to feed poor people if he becomes able to afford it after that?

He said to his wife: I swear a threefold oath (of divorce) that you will go to school

He swore that he would stop watching movies, then he watched a movie by mistake. Does he have to offer expiation, and how can he stop watching movies?