Sunan an-Nasa'i 3279
سنن النسائي#3279SahihIt 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
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 26:84