“Whoever introduces an innovation into this religion, will have it rejected.”
[Al-Bukhari and Muslim]
Ibn al-Yaman reported: Sufyan al-Thawri, may Allah have mercy on him, said, “Religious innovations are more beloved to Satan than sinful disobedience to Allah. Disobedience is repented from, but innovations are not repented from.”
Ḥilyat al-Awliyā’ 7/26
‘Abdallah b. ‘Amr reported God’s messenger as saying, “My people will experience what the B. Isra’il experienced, as closely as one sandal resembles another. If they had among them one who openly- had intercourse with his mother, among my people there will be one who does that. The B. Isra’il divided into 72 sects, but my people will divide into 73 sects, all of which but one will go to hell.” On being asked which it was, he replied, “It is the one to which I and my companions belong.”
Tirmidhi
Mishkat al-Masabih 171, 172
A version by Ahmad and Abu Dawud from Mu’awiya has, “Seventy-two will be in hell and one in paradise, it being the community. And folk will come forth from among my people in whom those passions will run as does hydrophobia in one who suffers from it, permeating every vein and joint.”
Who is an innovator? | AbdulRahman.Org
Clarification on Mawlid an-Nabi صلى الله عليه وسلم | Shaykh Uthman Ibn Farooq