Sunan an-Nasa'i 1278
سنن النسائي#1278SahihIt was narrated that Ibn 'Abbas said:"The Messenger of Allah (ﷺ) used to teach us the tashahhud just as he used to teach us a surah from the Quran
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
In-book reference: 13:100