"The Messenger of Allah said: 'Whoever introduces a good practice that is followed, he will receive its reward and a reward equivalent to that of those who follow it, without that detracting from their reward in their slightest. And whoever introduces a bad practice that is followed, he will receive its sin and a burden of sin equivalent to that of those who follow it, without that detracting from their burden in the slightest.'" (Using translation from Ibn Mājah 203)
قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ سَنَّ سُنَّةً حَسَنَةً عُمِلَ بِهَا بَعْدَهُ كَانَ لَهُ مِثْلُ أَجْرِ مَنْ عَمِلَ بِهَا مِنْ غَيْرِ أَنْ يُنْقَصَ مِنْ أَجْرِهِ شَيْءٌ وَمَنْ سَنَّ سُنَّةً سَيِّئَةً كَانَ عَلَيْهِ مِثْلُ وِزْرِ مَنْ يعَمِلَ بِهَا مِنْ غَيْرِ أَنْ يُنْقَصَ مِنْ أَوْزَارِهِم شَيْءٌ»