Who said "A warrior's oath is sacred—more binding than any chain."?

This quote is attributed to Thor (Age of Ultron).

A warrior's oath is sacred—more binding than any chain. - Thor (Age of Ultron)

"A warrior's oath is sacred—more binding than any chain."

Thor (Age of Ultron)

"I am mighty, but I am not all-powerful. This is a lesson I continue to learn."

"A warrior's strength comes not just from muscles, but from the heart that drives them."

"We are stronger together than we could ever be apart."

"The best of us must sometimes make the hardest choices."