Abdulhussain in letter 48 said:
Consider the statement of the Messenger of Allah peace be upon him and his progeny while holding `Ali’s neck “This is the Imam of the righteous the slayer of the debauchees; victorious is whoever supports him forsaken (by Allah) is whoever abandons him.” He (p.b.u.h.) raised his voice while saying the last phrase.
And in the same letter he said:
Consider his statement peace be upon him and his progeny “It has been revealed to me that `Ali has three exclusive merits: that he is the chief of the Muslims the Imam of the righteous and the leader of those whose foreheads radiate with the mark of faith.”
As for the first hadith it was transmitted by al-Hakim in “Mustadrak”. In the chain of it is Ahmad ibn Abdullah ibn Yazeed al-Harrani, and he was liar. (Mizanul itidal 1/109/№429)
Albani in “Silsila ad -daifa” (353), Dhahabi in “Talhis al-Mustadrak” and ibn Adi in “Kamil” (1/192/n132) said that this hadith is fabrication.
As for the second one. It was narrated by al-Hakim in “Mustadrak”. In the chain Amr ibn Khasin al-Uqayli and Yahya ibn Ala ar-Razi, both of them were liars. See “Mizanul itidal” 3/252/№6351 and 4/397/№9591.
This hadith was also transmitted by Tabarani in “Mujam as-saghir” (n 1012). al-Heythami in “Majmau zawaid” (n 14700) said: “Narrated by Tabarani in “as-Saghir” in the chain is Amr ibn Sawadat and he was liar”. Ibn Muin also said that this narrator was liar. (“Mizanul itidal” 3/312/№6569). This liar isn’t a single problem in chain, other one is Mujashi ibn Amr, and he was also accused. (“Mizanul itidal” 3/436/№7066.)
Albani in “Silsila ad-daifa” (n 353), Dhahabi in “Talkhis” graded this hadith as fabricated one. Ibnul Imad said: This hadith is extremely rejected and looks like it’s fabricted by extreme shias, such character suitable to prophet (sallalahu alaihi wa ala alihi wa sallam) and not to Ali”. (“Kanzal ummal” n 33010, Muasasat risala, Beirut).
Wa Allahu Alam.