Who said "The living seek immortality; I am already beyond death."?

This quote is attributed to The Night King.

The living seek immortality; I am already beyond death. - The Night King

"The living seek immortality; I am already beyond death."

The Night King Death

"The living are not my concern."

"Death is the enemy. And we are joining the fight against it."

"Winter came for House Umber."

"I am the night."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."