Who said "I am Death, and I have never been busier."?

This quote is attributed to Death.

I am Death, and I have never been busier. - Death

"I am Death, and I have never been busier."

Death Death

Character in The Book Thief

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"I have hated words and I have loved them, and I hope I have made them right."

"The consequence of this is that I'm always finding human bones at number 33."

"I am haunted by humans."

"She was a girl who decided to steal books."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."