Sunan Ibn Majah 1495
سنن ابن ماجه#1495Sahihحَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ عُثْمَانَ، عَنِ الْحَكَمِ، عَنْ مِقْسَمٍ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَرَأَ عَلَى الْجِنَازَةِ بِفَاتِحَةِ الْكِتَابِ .
It was narrated from Ibn ‘Abbas that the Prophet (ﷺ) recited the Opening of the Book (Al-Fatihah) in the funeral prayer
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-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 6:63