Excerpt from 'The sufferings of Amirol Mo'minin, Ali ibn Abi Talib: Life and Martydom':
The Prophet (S) in the twenty-three years of his Mission, often told me that a day would come, when some of my companions, who fasted in the day and recited the Qur’an in the night Holy, would stand against me, and I would be in a war with them, because they would go out of the religion as an arrow penetrates and goes out of a game.