Nemici senza cor, from Medea (sung by Maria Callas, 1957)
Heartless enemies, my sly rival,
you wish to torment me!
I call on the gods of Hell
to witness my fatal oath
as well as the gods of Olympus!
this traitorous wedding
no one will be able to bless
no, no! I call on the gods to witness,
no one will be able to bless this traitorous wedding!
This wedding shall not be, I swear it to the gods!
O gods, thwart her deadly threats!
defend the king ever from her vengeance!
And always keep safe, o gods, both palace and sacred soil!
Oh fatal Golden Fleece!
Bitter glory of triumph!
How much blood, how many tears
you have cost me already!