عَنْ عَائِشَةَ قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَحْدَثَ فِي أَمْرِنَا هَذَا مَا لَيْسَ مِنْهُ فَهُوَ رد»

Ibn ‘Abbas reported God’s messenger as saying, “The people most hateful to God are of three classes

he who is heretical in the sacred territory, he who wants to introduce into Islam the sunna of the pre-Islamic period, and he who unjustly demands the death of a Muslim to shed his blood.” Bukhari transmitted it.