What is the ruling of Islamic law on a Muslim who urinated and bathed with his urine for five consecutive days to break a spell he claimed to have been afflicted with?

It is not permissible to bathe with impurities, whether urine or anything else. This act does not cure magic; rather, it increases it. What cures magic is ruqyah (exorcism) with Quranic verses, adhkar (remembrances of Allah), and lawful supplications. This act indicates that the one who commanded it is among sorcerers and charlatans, because jinn and devils love impurities and dwelling in them. In summary, this act is impermissible due to its involvement with impurities, its leading to charlatans, and its pleasing of devils.