Who said "Death is the only mercy I offer to those who oppose me."?

This quote is attributed to Smaug.

Death is the only mercy I offer to those who oppose me. - Smaug

"Death is the only mercy I offer to those who oppose me."

Smaug Death

"I am fire. I am death."

"You have no idea what you're dealing with."

"I am armored above and below with iron scales and hard gems."

"My armor is like tenfold shields, my teeth are swords, my claws spears."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."