Sunan an-Nasa'i 3279
سنن النسائي#3279Sahihأَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ أَنْبَأَنَا عَبْدُ الرَّحْمَنِ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ الْعَزِيزِ، عَنْ تَمِيمِ بْنِ طَرَفَةَ، عَنْ عَدِيِّ بْنِ حَاتِمٍ، قَالَ تَشَهَّدَ رَجُلاَنِ عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَقَالَ أَحَدُهُمَا مَنْ يُطِعِ اللَّهَ وَرَسُولَهُ فَقَدْ رَشَدَ وَمَنْ يَعْصِهِمَا فَقَدْ غَوَى . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " بِئْسَ الْخَطِيبُ أَنْتَ " .
It was narrated that 'Adiyy bin Hatim said:"Two men recited a Tashahhud before the Prophet and one of them said: 'Whoever obeys Allah and His Messenger has been guided aright and whoever disobeys them has gone astray.' The Messenger of Allah said: 'What a bad speaker you are
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:
In-book reference: 26:84