​Aggression

The evil deed to be punished the quickest is agression.

رسولُ اللَّهِ صلى اللَّه عليه وآله :  إنَّ أعجَلَ الشَّرِّ عُقوبَةً البَغيُ . الكافي : 2 / 327 / 1 .

 The Prophet (SAWA) said, 'The evil deed to be punished the quickest is agression.' al-Kafi, v. 2, p. 327, no. 1