'Aishah (May Allah be pleased with her) reported:
Messenger of Allah (ﷺ) said, "If anyone introduces in our matter something which does not belong to it, will be rejected".[Al-Bukhari and Muslim].The narration in Muslim says: "If anybody introduces a practice which is not authenticated by me, it is to be rejected". (DE)
Arabic/English book reference (DE): Book 1, Hadith 169 (DE)