Harry Potter and the Sorcerer's Stone
"A Muggle," said Hagrid, "it's what we call nonmagic folk like them. An' it's your bad luck you grew up in a family o' the biggest Muggles I ever laid eyes on." (4.82)
"But what does a Ministry of Magic do?"
"Well, their main job is to keep it from the Muggles that there's still witches an' wizards up an' down the country." (5.50-51)
"Help yourself," said Harry. "But in, you know, the Muggle world, people just stay put in photos."
"Do they? What, they don't move at all?" Ron sounded amazed. "Weird!" (6.186-187)