Al-Tirmidhi HadithHadith 168 Narrated byBilal ibn Harith al-Muzani

Allah's Messenger (peace be upon him) said: He who revived a Sunnah out of my Sunan, which has died after me, for him is the reward like the reward of those who acted upon it, without any decrease in that reward. He who introduced some evil innovation which Allah and His Messenger did not approve has (a burden of sin upon him) like the sins of one who acted according to it, without their sins being mitigated thereby in the least.