You have to swear upon the holy cross
That hilts this sword, that neither Donna Anna
Know that I ever loved her, nor Don Cesar
I ever cross’d his love.
Ar. Upon this cross
I swear it; and beseech you in return
Never, my lord, to tell Don Cesar who
Reveal’d his secret.
Prince. Be it so. I promise.
And now to see whether indeed I dare