Allah the almighty says in the Qur'an describing the righteous people:
They [are those who] fulfill [their] vows and fear a Day whose evil will be widespread. (76:7)
I'm not sure whether there's a consensus on accepting vows (nadhr النذر) among scholars, but I'd like to know how is it defined or what exactly constitutes a nadhr and distinguish it from a promise or oath?
Examples and counter-examples would be helpful!
For example is having in mind to fast each Monday and Thursday from now on a nadhr or do I need a specific wording or must I utter it?