Sunan Ibn Majah 1532
سنن ابن ماجه#1532Sahihحَدَّثَنَا مُحَمَّدُ بْنُ حُمَيْدٍ، حَدَّثَنَا مِهْرَانُ بْنُ أَبِي عُمَرَ، عَنْ أَبِي سِنَانٍ، عَنْ عَلْقَمَةَ بْنِ مَرْثَدٍ، عَنِ ابْنِ بُرَيْدَةَ، عَنْ أَبِيهِ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ صَلَّى عَلَى مَيِّتٍ بَعْدَ مَا دُفِنَ .
It was narrated from Ibn Buraidah from his father that the Prophet (ﷺ) offered the funeral prayer for a deceased person after he had been buried
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 Lighairihi
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiSahih
In-book reference: 6:100