Placido Domingo and Renee Fleming singing "Laisse-moi, laisse-moi contempler ton visage" from Gounod's Faust

From Wikipedia:

Marguerite allows Faust to kiss her (Laisse-moi, laisse-moi contempler ton visage), but then asks him to go away. She sings at her window for his quick return, and Faust, listening, returns to her. Under the watchful eye and malevolent laughter of Méphistophélès, it is clear that Faust's seduction of Marguerite will be successful.