Another couple of solid hadiths from the Sunni scholar, Al-Haakim.

Hadith 1 (#4617 in image) – The Messenger of Allah (swt) said: “Whoever obeys me, he has obeyed Allah (swt), and who every disobeys me, he has disobeyed Allah (swt); And whoever obeys Ali (as), he has obeyed me, and who has disobeyed Ali (as) has disobeyed me

Source: Mustadrak `ala Al-Sahihain, Al-Haakim, Volume 3, Page 131

Grading: Al-Haakim says it is Sahih/Authentic in it’s chain, but we do not see find (this hadith in Bukhari or Muslim); Al-Dhahabi concurs, It is Sahih.

Hadith 2 (#4618 in image) – A man from the people of Shaam (followers of Mu’awiyah) came and he insulted (sabb) Ali (as) in the presence of Ibn Abbas. So Ibn Abbas (as) was angered and said: “Oh enemy of Allah (swt)! You have hurt The Messenger of Allah (sawa)! Verily the one who annoys Allah (swt) and his Messegner (sawa) is cursed by Allah (la`anahum Allah) in this world and the Hereafter! And a humiliating punishment is promised, and if the Messenger of Allah (sawa) was alive you would have annoyed him!”

Source: Mustadrak `ala Al-Sahihain, Al-Haakim, Volume 3, Page 131

Grading: Al-Haakim says it is Sahih/Authentic in it’s chain, but we do not see find (this hadith in Bukhari or Muslim); Al-Dhahabi concurs, It is Sahih.

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Note: Ibn Abbas quoted the ayah from the Qur’an: “Indeed, those who abuse Allah and His Messenger – Allah has cursed them in this world and the Hereafter and prepared for them a humiliating punishment.” (33:57)