As for the ruling on impurity in removing the slippers, then impurity is alienation and foreign impurity. If a strange matter occurs in the heart that discredits the Sharia, he should consider it with reason without inferring the Sharia, such as if the mind of a Brahmin who denies the Sharia occurs to him, so he does not accept Sharia evidence to invalidate this statement that occurred to him. It is the subject of the dispute, so he must move from inferring according to Sharia law to inferring what the theoretical evidence gives him, whether that happens to him, such as when he is present, or for someone else, such as traveling. Just as the one who is in a state of impurity, whether he is traveling or present, it is necessary to remove his socks.