Peter's Denial Lyrics

I think I've seen you somewhere
I remember
You were with that man
They took away
I recognize your faceYou've got the wrong man, lady
I don't know him
And I wasn't where
He was tonight
Never near the placeThat's strange
For I am sure I saw you with him
You were right by his side
And yet you denied?I tell you
I was never ever with him
But I saw you too
It looked just like youI don't know himPeter don't you know what you have said
You've gone and cut him deadI had to do it
Don't you see?
Or else they'd go for meIt's what he told us you would do

I wonder how he knew?