Imam Ja'far Sadeq (as) says:
He who has even a little arrogance in his heart will not be allowed to enter Heaven.
لا يَدْخُلُ الجَنَّةَ مَنْ فِي قَلْبِهِ مِثْقَالُ ذَرَّةٍ مِنْ كِبْر.
Al-Kafi, Vol. 2, p. 310.
The Holy Prophet (S):
Beware whoever dies with the hatred of Ale Muhammad,dies a disbeliever; beware whoever dies with the hatred of Ale Muhammad will never smell the fragrance of paradise.
ألا ومَن ماتَ عَلى بُغضِ آلِ مُحَمَّدٍ ماتَ…