We do not speak his name.
4 seconds sound clip from the Harry Potter and the Sorcerer's Stone movie soundboard.
You can hear this line at 00:30:00 in the Blu-ray version of the movie.
Quote context
[...]
- I remember every wand I've ever sold, Mr. Potter.
- It is curious that you should be destined for this wand... when its brother gave you that scar.
- The wand chooses the wizard, Mr. Potter. It's not always clear why.
- But I think it is clear... that we can expect great things from you.
- After all, He-Who-Must-Not-Be-Named... did great things. Terrible... yes, but great.
- Harry! Harry! Happy birthday.
- You all right, Harry? You seem very quiet.
[...]