Sunan Ibn Majah
20
Sahih+2

It was narrated that Ali bin Abu Talib said :"When I narrate a Hadith from the Messenger of Allah (ﷺ), to you, then think of him as being the best, the most rightly guided and the one with the utmost Taqwa (piety, righteousness)

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi