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 Justice

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."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."