Ibne Abbas, from the MESSENGER OF ALLAH (SWT) said:
Those who go against ALI (ASWS) after me are Kafers and those who believe that ALI (ASWS) has partners are polytheists.
Those who love ALI (ASWS) are believers and those who hate ALI (ASWS) are hypocrites.
Those who follow ALI (ASWS) will join him (on the Day of Judgement). Those who fight ALI (ASWS) are apostates, and those who oppose ALI (ASWS) will be destroyed.
ALI (ASWS) is the light of ALLAH (SWT) in His land and ALI (ASWS) is ALLAH (SWT)’s decisive argument on his creation.
ALI (ASWS) is ALLAH (SWT)’s sword on His enemies. ALI (ASWS) is the heir of the knowledge of ALLAH (SWT)’s PROPHETs. ALI (ASWS) is ALLAH (SWT)’s Most Exalted word, and ALI (ASWS) is the most hated word of his enemies.
ALI (ASWS) is the master of the successors, and he is the successor of the MASTER OF THE PROPHETS (SAWW).
ALI (ASWS) is the Commander of the Believes, IMAM Of the Muslims, and he is the glorified leader of the companions of Paradise.
ALLAH (SWT) will not accept the belief of anyone who does not believe in the WILAYAT of ALI (ASWS) and who does not obey him.
(Ref: AmaALI of Sadouq 29).