The Proof that the Deviant Sects have emerged is from the following narration:

Imām al-Barbahārī (rahimahullāh, died 329 AH) stated: “Know that Allah’s Messenger (salallāhu ‘alaihi wasallam) said: “My ummah will divide into 73 sects, all of them will be in the Fire except for one, and that is the Jamā’ah.” It was said, “And who are they, O Allah’s Messenger?” He (salallāhu ‘alaihi wasallam) responded, “That which I and my Companions are upon today.”

[ Tirmidhī, no. 2641 and this narration has support from the Hadith of Anas which is reported by At-Tarbarani in al-Awsat [7840] and As-Saghir [724].] [*There are many more sources which are too long to be mentioned here.]