Aisha reported: The Messenger of Allah, peace be upon him, said:
مَنْ أَحْدَثَ فِي أَمْرِنَا هَذَا مَا لَيْسَ فِيهِ فَهُوَ رَدٌّ
Whoever innovates something into this affair of ours which does not belong to it will have it rejected.
[Sahih Bukhari, Book 49, Number 861 ]