Is merely intending to prevent someone from doing something by saying, "By God, don't change anything," considered a binding oath, or is it a condition to have the intention of swearing an oath when saying it?

The saying "By Allah, do not do such-and-such" is a binding oath (yamin mun'aqidah) for which expiation (kaffarah) is required upon breaking it. Whereas "I ask you by Allah to do such-and-such" could be a request or an oath. If it is a request, no expiation is required for it. If a person swears an oath concerning a future matter and intends it as an oath, then expiation is binding upon breaking it, even if he did not recall that it was an oath. However, if the oath slipped from his tongue unintentionally, it is considered a 'laghw' (idle or vain) oath for which there is no expiation. If a person swears an oath upon another to do something, and the person sworn upon does not do it, then expiation is binding upon the one who swore the oath.