Some have argued that Mansur Al-Hallaj's statement of 'Ana al-Haqq' (I am the Truth) alludes to the idea of annihilating the self for Allah (swt), while others have viewed it as heresy. What is the Shi'i view of his statement?
Hussain Ibn Mansoor Al-Hallaaj was a Sufi who deviated and claimed that he is a representative of Imam Al-Mahdi (AS). He claimed many dangerous claims including claiming that he is Allah or part of Allah (SWT). He was cursed by our Shia scholars as well as as Sunni scholars. Our great scholar Shaikh Al-Mufeed wrote a book against him and his cult called Tasheeh Al-E'tiqadaat Al-Imamiyyah. His claim (Ana Al-Haqq) shows his deviation and falsehood.
Even Sunni scholars refused his false claims and complained against him to the Abbasid king Al-Moqtadir who killed him in year 309 Hijri.
His cult was called Al-Hallajiyyah and they did not pray Salah nor perform any Islamic worship. This was mentioned by Shaikh Al-Sadouq in Al-E'tiqadaat (97).
Wassalam,
