The debt has been completed and it is not permissible to add to it, just as it is not permissible to subtract from it. Whoever hits his father with a stick does not do good to him, and whoever does not do good to his father has disobeyed what God commanded him to do with his parents. And whoever rejects the words of his parents and does what his parents do not approve of is permissible for him. If he left it, he disobeyed them. It has been proven that disobedience to one’s parents is a major sin. That is why we said that purifying oneself with dirt, which is tayammum, is not an alternative. Rather, it is permissible, just as water is prescribed, and it has a special description of its action, for it is clear that we do not use it except on the face or my hands, and ablution and washing are not like that, and an alternative should replace it. What is changed from it? This is what replaced what is changed from it in the action. And God speaks the truth and He guides the path.