The love duet “Oui c’est toi que j’aime” from Gounod’s Faust

From Wikipedia:

As dawn approaches, Faust sees a vision of Marguerite and calls for her. Méphistophélès helps Faust enter the prison where Marguerite is being held for killing her child. They sing a love duet (Oui, c’est toi que j’aime).