Is it permissible to swear by the uncorrupted Gospel, on the basis that it is a book from God?

Swearing by the Gospel that is free from distortion constitutes a binding oath, necessitating expiation, because it is the word of Allah. The general term refers to what was revealed by Allah, not what has been altered or replaced. Its sacredness is not diminished by its rulings being abrogated, just as abrogated verses of the Qur'an do not cease to be the word of Allah. This does not remove it from being the word of Allah and one of His attributes.