Under curse and again under curse...
Under curse and again under curse, under wrath and again under wrath, is he who rejects this saying of mine and does not does not agree with it. Certainly, Gabriel has informed me of this from Allah, the most high, Who also said: “Anyone who bears enmity against Ali and refuses his authority, for him shall be My curse and My wrath.” Thus, every soul should look to what he has sent forth for the morrow.
Be watchful of (your duty towards) Allah lest you should oppose Him and (your) foot should slip after its stability. Verily, Allah is well-acquainted with (all) that you do. 1 O people! He (i.e., Ali) is “the side of Allah”2 that is mentioned in Allah’s Book. He, the exalted, says, “Lest a soul should (then) say: ‘Ah! Woe onto me that I abused and neglected (my duties towards) the side of Allah.’”3 O people! Reflect on the Quran and comprehend its verses.
Look into its clear verses and do not follow its ambiguous parts,4 1 cf. Verses 59:18 and 16:94 of the Holy Quran. 2 Side is used to express extreme nearness. One’s side is the closest thing to an individual. Imam Ali (PBUH) is called the “side” of Allah because he got “close” to Him through obedience so much so that he became the criterion of nearness to Allah and His recognition.
In this manner, nearness to Imam Ali (PBUH) indicates nearness to Allah, neglecting his right indicates neglecting Allah's right, forsaking him indicates forsaking Allah, and recognizing him in one's heart indicates recognizing Allah. 3 Chapter 39, Verse 56 of the Holy Quran. 4 Allah states in Chapter 3, Verse 7 of the Holy Quran: “It is Him Who has sent down to you the Book, within which are some clear verses that are the foundation of the Book, and other verses that are ambiguous.
But, those in whose hearts is perversity follow the part thereof that is ambiguous, seeking enticement and attraction (of for by Allah, none shall be able to explain to you its warnings and its mysteries,1 nor shall anyone clarify its interpretation, other than the one that I have grasped his hand, brought up beside myself, [and lifted his arm,].
the one about whom I inform you that whomever I am his master, this Ali is his master; people towards their own views), and searching for its hidden meaning. But, no one knows its interpretation except Allah and those who are firmly grounded in knowledge…” According to the traditions, “those who are firmly grounded in knowledge” refers exclusively to the Prophet (PBUH&HF) and his family (Ahl al-Bait (PBUT)).