In the 6th book. In "The Seer Overheard" chapter of Harry Potter and the Half-Blood Prince, Professor Trelawney mentions to Harry that when she was applying for a job teaching Divination at Hogwarts, she had her interview with Dumbledore in the room she had rented at the Hog's Head inn. Although she does not remember it (she only remembers feeling "a little odd"), during the course of the interview she went into a trance and told Dumbledore the prophecy (USA Scholastic hardcover edition, pp544 - 545).
Before she could finish telling Dumbledore the prophecy, they were interrupted. The door to her room flew open, and standing on the other side was the innkeeper (who, as we find out in Book 7, is Dumbledore's brother, Aberforth) and Severus Snape. The innkeeper had caught Snape eavesdropping on the interview, and the prophecy.
Harry realizes that this means that Snape was the one who relayed the prophecy to Voldemort, thereby causing his parents' murder. Harry runs to Dumbledore and has a temper tantrum about it.
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SPOILER ALERT!!!!
In the seventh book, we see Dumbledore tell him this, and that Snape must give the right date so Voldemort will continue to think he is a loyal Death eater. This information comes out during the chapter when Harry looks at Snape's memories in the Pensive.
It is actually Snape who Imperious' Mungdungus Fletcher to give the idea of the Seven Potter's, and to move him before his 17th birthday. Snape then gives Voldemort the correct date as stated above for the very fact to prove he is loyal only to Voldemort and is giving correct information from within the Order of the Phoenix.
I suppose you mean in book 4. Voldemort mentioned that when he was talking with his Death Eaters in the graveyard.
SPOILERS Snape is mean (to Harry) as he hated harr'y dad and harry look's just like him but on the other side of harry family tree , snape loved lily and was secretly portect him and he ends up diying to save his ture love's only son. also he just don't like other people sometimes and hate gryffindors anyway
Snap loved Lily, and probably wanted to marry her and have a baby with her someday, if James didn't. But if they did have a child, it would be a completely different person. When Snape first met Harry, he thought that he resembled his father, who he hated. But towards the end, you find out that he had protected Harry many times; which probably meant that he did want to be Harr's father.
No. Voldemort kills Snape before the battle is over. But even if Snape had survived, Harry would probably have testified on his behalf, and told everyone how Snape was really working for Dumbledore the whole time. In fact, Harry did say something to that effect, out loud so everyone could hear, during his final duel with Voldemort.
As Harry watches Snape bleed to death on the floor of the Shrieking Shack, Snape starts oozing memories, in the form of a silvery-blue substance, out of his ears and nose and eyes, and Harry gathers them up in a vial that Hermione conjures for him. He goes to Dumbledore's office, puts the memories into the Pensieve, and watches them. The memories chronicle some of the most important scenes and events of Snape's life, from his childhood with Lily Evans, to the events surrounding Lily and James' death, up until just a few months before his own death. In a nutshell, the memories prove to Harry that Snape was Dumbledore's man, through and through.
You may have to write one yourself.