They had a cat… perhaps it had perished, like his parents at Godric’s Hollow… or else fled when there was nobody left to feed it… Sirius had bought him his first broomstick… His parents had known Bathilda Bagshot; had Dumbledore introduced them?
Jubilant at her capitulation, Lucius threw her hand from him and ripped up his own sleeve — "STOP!" shrieked Bellatrix, "Do not touch it, we shall all perish if the Dark Lord comes now!"
There are no more uses of "perish" in the book.
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...government of the people, by the people, for the people shall not perish from the earth.