Major Sins in Islam – Betrayal – Cursing – Disloyalty – Spying – Astrology

The Prophet said also : A friend should not be a curser. The Prophet also said : the believer is not a slanderer, nor a curser, nor atrocious, nor obscene. He said also : When a man curses a thing this curse goes up towards Paradise, the doors of Paradise are shut against it, the curse then moves right and left it finds no way for it, then it goes back down to the cursed one if he deserves it or else to the curser.