Severus Snape in Canon


Half-Blood Prince

Chapter 4
Horace Slughorn

"If I'm having lessons with you, I won't have to do Occlumency lessons with Snape, will I?"

"Professor Snape, Harry -- and no, you will not."

"Good," said Harry in relief, "because they were a --"

He stopped, careful not to say what he really thought.

"I think the word 'fiasco' would be a good one here," said Dumbledore, nodding.

Harry laughed.

"Well, that means I won't see much of Professor Snape from now on," he said, "because he won't let me carry on Potions unless I get 'Outstanding' in my O.W.L., which I know I haven't."

"Don't count your owls before they are delivered," said Dumbledore gravely.
pg 79