Who said "They were united by the binding of the book."?

This quote is attributed to Death.

They were united by the binding of the book. - Death

"They were united by the binding of the book."

Death Friendship

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."

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."