L'angue offeso mai riposa

English Libretto or Translation:

Sesto
(only)
Son is not, who revenge does not take care of the genitor the havoc.
So to revenge
prepare you, alma forte,
and before death someone else gives death! 

Sesto Air
The angu offended never rests,
if the first poison does not spread in the blood to the offensor.
So my soul does not dare
to show up haughty and big,
if he does not spare the impious cor.
(part)