I never saw you either, but I know you. Now I can prove it.
5 seconds sound clip from Longstreet (1971) - I See, Said The Blind Man sitcom.
You can hear this line at 00:46:32.500 in the Blu-ray version of the TV Series.
Quote context
[...]
- Yes. And he can describe the man.
- What do you want? What are you doing here?
- You killed Mavis Rustin. I heard you. And someone saw you.
- I'm afraid you're mistaken. I don't know you. I never saw you.
- I never saw you either, but I know you. Now I can prove it.
- How are you? Oh, careful, careful. I guess you're going to say hello, huh?
[...]