Sunan Ibn Majah 50
سنن ابن ماجه#50Da'ifحَدَّثَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ، حَدَّثَنَا بِشْرُ بْنُ مَنْصُورٍ الْخَيَّاطُ، عَنْ أَبِي زَيْدٍ، عَنْ أَبِي الْمُغِيرَةِ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " أَبَى اللَّهُ أَنْ يَقْبَلَ عَمَلَ صَاحِبِ بِدْعَةٍ حَتَّى يَدَعَ بِدْعَتَهُ " .
It was narrated that 'Abdullah bin 'Abbas said:"The Messenger of Allah (ﷺ) said: 'Allah refuses to accept the good deeds of one who follows innovation until he gives up that innovation
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniDaif
Muhammad Fouad Abd al-BaqiDaif
Shuaib Al ArnautVery Daif
Zubair Ali ZaiDaif