And, Harry, just be careful.
5 seconds sound clip from the Harry Potter and the Sorcerer's Stone movie soundboard.
You can hear this line at 02:13:11 in the Blu-ray version of the movie.
Quote context
[...]
- Take care of Ron. Then go to the owlery. Send a message to Dumbledore. Ron's right.
- You'll be okay, Harry. You're a great wizard. You really are.
- Me? Books and cleverness. There are more important things. Friendship and bravery.
- And, Harry, just be careful.
- You? No, it can't be. Snape, he was the...
- Yes, he does seem the type, doesn't he?
- Next to him, who would suspect... poor, stuttering Professor Quirrell?
- But that day, during the Quidditch match, Snape tried to kill me.
- No, dear boy. I tried to kill you!
[...]