Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 20284a
"مَنْ أَحْيَا سُنَّةً مِنْ سُنَّتِى قَد أُمِيتَتْ بَعْدِى فإِنَّ لَهُ مِنَ الأجْرِ مِثْلَ منْ عَمِلهَا منَ النَّاسَ لا يَنْقُصُ من أجُورِ النَّاسِ شَيئًا، وَمَنْ ابْتَدَعَ بِدْعةً لَا يرْضَاهَا اللهُ وَرَسُولُه، فإِنَّ عَليهِ مِثْلَ إِثْمٍ مَنْ عَمِلَ بِهَا مِنَ النَّاسِ، لَا يَنْقُصُ مِنْ آثَامِ النَّاسِ شَيئًا".
Translation
Machine translation, not reviewed
"Whoever revives a Sunnah of mine that has been abandoned after me, he will have a reward like the reward of those among the people who act upon it, without the rewards of the people being diminished in the least. And whoever innovates an innovation that Allah and His Messenger do not approve, he will bear a sin like the sin of those among the people who act upon it, without the sins of the people being diminished in the least."
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Notes
[طب] الطبرانى في الكبير وأبو نصر السجزى في الإبانة عنه
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