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مَنْ أَحْدَثَ فِي أَمْرِنَا هذَا مَا لَيْسَ مِنْهُ فَهُوَ رَدٌّ

رَوَاهُ البُخَارِيُّ

مَنْ عَمِلَ عَمَلاً لَيْسَ عَلَيْهِ أَمْرُناَ فَهُوَ رَدٌّ

رَوَاهُ مُسْلِمٌ

It is narrated on the authority of the Mother of the Believers, Umm 'Abdullah 'Aishah, radiyallahu 'anha, that the Messenger of Allah, sallallahu 'alayhi wasallam, said:

"Whosoever introduces into this affair of ours (i.e. into Islam) something that does not belong to it, it is to be rejected."

[Al-Bukhari]

"Whosoever works a work which has for it no command of ours is to be rejected."

[Muslim]