Hadith #5: Ibadah (Worship) and Bid'ah (Innovation)
مَنْ أَحْدَثَ فِي أَمْرِنَا هذَا مَا لَيْسَ مِنْهُ فَهُوَ رَدٌّ
رَوَاهُ البُخَارِيُّ
مَنْ عَمِلَ عَمَلاً لَيْسَ عَلَيْهِ أَمْرُناَ فَهُوَ رَدٌّ
رَوَاهُ مُسْلِمٌ
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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]