For when innovations which oppose the ḍīn of the Messengers appear, Allāh seeks revenge from whoever opposes the Messengers and aids them (the Messengers)...

The innovations of the Khawārij, the Shīʿah, the Murjiʾah and the Qadariyyah have resemblance in the texts of the Prophets...

The origin, starting point of Bid’ah is revilement of the Sunnah by (one’s) suspicion and desire, just as Ibless reviled the command of His Lord with his opinion and desire.