Is expiation obligatory for someone who vowed to Allah to get rid of obsessive-compulsive disorder but then broke their vow, and is it permissible to make an exception to a vow to Allah, like an oath, and are the oaths of a person suffering from obsessive-compulsive disorder, who is on the verge of losing their mind, considered binding?

It is obligatory to fulfill a covenant made with Allah, and breaking it necessitates repentance and an expiation for an oath (kaffarat yameen). If the breaking of the covenant by abandoning the obsessive thoughts occurred through an action, such as repeating the takbir, then an expiation for an oath becomes obligatory, unless there was an exception made by saying "Insha'Allah" (if Allah wills) connected to the covenant. However, mere self-talk and thinking are not considered a breach of the covenant, as the Prophet, peace and blessings be upon him, said: "Indeed, Allah has pardoned for my Ummah what they talk to themselves about, as long as they do not speak of it or act upon it." It is permissible to make an exception from a covenant with Allah, similar to an oath, provided that the intention for the exception exists and it is connected to the oath without separation. The oaths of a person suffering from obsessive thoughts are binding as long as their mind is present, but if their statements and actions are predominantly affected by disorder, then their statements are not considered.