Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Apostasy from Islam in a dream indicates dismissal from a position, death of a son, or corruption in religion.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Apostasy indicates loss in trade and poverty after wealth.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Apostasy is interpreted as worry and grief. Whoever sees himself apostatize will be afflicted with great worry.