Who said "I don't ask others to do what I won't do myself."?

This quote is attributed to Captain America (The Avengers).

I don't ask others to do what I won't do myself. - Captain America (The Avengers)

"I don't ask others to do what I won't do myself."

Captain America (The Avengers) Leadership

"I can do this all day."

"When I was a kid, I couldn't do any of this. Now I can fight with the best of them."

"Big man in a suit of armour. Take that off, what are you?"

"I'm just a kid from Brooklyn."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"