Sunan Ibn Majah
Sunan Ibn Majah 210
حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا إِسْمَاعِيلُ بْنُ أَبِي أُوَيْسٍ، حَدَّثَنِي كَثِيرُ بْنُ عَبْدِ اللَّهِ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " مَنْ أَحْيَا سُنَّةً مِنْ سُنَّتِي قَدْ أُمِيتَتْ بَعْدِي فَإِنَّ لَهُ مِنَ الأَجْرِ مِثْلَ أَجْرِ مَنْ عَمِلَ بِهَا مِنَ النَّاسِ لاَ يَنْقُصُ مِنْ أُجُورِ النَّاسِ شَيْئًا وَمَنِ ابْتَدَعَ بِدْعَةً لاَ يَرْضَاهَا اللَّهُ وَرَسُولُهُ فَإِنَّ عَلَيْهِ مِثْلَ إِثْمِ مَنْ عَمِلَ بِهَا مِنَ النَّاسِ لاَ يَنْقُصُ مِنْ آثَامِ النَّاسِ شَيْئًا " .
Muhammad ibn Yahya reported to us: Ismail ibn Abi Uways reported to me: Kathir ibn Abdullah reported to me, from his father, from his grandfather, who said: I heard the Messenger of Allah (Allah bless him and grant him peace) say, ‘Whoever revives one of my practices that has been made obsolete after me will have a reward equal to the rewards of those among the people who act upon it, without any reduction in their rewards. Whoever introduces an innovation not approved by Allah and His Messenger will bear a sin equal to the sins of those among the people who act upon it, without any reduction in their sins.’
Translation notes
The Arabic explicitly qualifies the innovation as one not approved by Allah and His Messenger.