What is the ruling on saying "al-Dahiya" (the calamity/mastermind) about the Mushaf, and does it necessitate an expiation?

The Book of Allah must be revered and protected. It is not permissible to describe the Mushaf (copy of the Qur'an) as "the wicked one" or "the calamity." Whoever does so out of contempt for it has apostatized. Since you did not intend contempt and have repented, sought forgiveness, and uttered the Two Testimonies of Faith, we hope that no harm will befall you. It is obligatory to avoid such behavior in the future, and its expiation is seeking forgiveness. You must avoid anger, for it leads to mistakes.