Sunan an-Nasa'i 1973
سنن النسائي#1973Sahihأَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ أَنْبَأَنَا إِسْمَاعِيلُ، عَنْ أَيُّوبَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِنَّ أَخَاكُمْ قَدْ مَاتَ فَقُومُوا فَصَلُّوا عَلَيْهِ " . فَصَفَفْنَا عَلَيْهِ صَفَّيْنِ .
It was narrated from Jabir that:the Messenger of Allah said: "Your brother has died, so get up and offer the funeral prayer for him." So we formed two rows for him
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:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 21:156