Kathir bin ‘Abdullâh bin ‘Amr bin ‘Awf Al-Muzani said: My father told me, narrating trom my grandfathers that the Messenger of Allah p.b.u.h said: Whoever revives a Sunnah of mine, which people then act upon will have a reward equivalent to that of those who act upon it, without that detracting from their reward in the slightest. And whoever introduces an innovation (Bid’ah) that is acted upon, will have a burden of sins equivalent to that of those who act upon it, without that detracting from the burden of those who act upon it in the slightest,’