Who said "A Lannister always pays his debts"?

This quote is attributed to Tyrion Lannister.

A Lannister always pays his debts - Tyrion Lannister

"A Lannister always pays his debts"

Tyrion Lannister

Character in A Game of Thrones

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"A man's got to know his limitations."

"The gods flip a coin."

"That's what I do. I drink and I know things."

"Lannister always pays their debts."