You mean Robert Duvall, who played Lucky Ned Pepper in the original film.

Here's the dialogue --

[Rooster confronts four outlaws facing him in line abreast across a field]

Ned Pepper: What's your intention? Do you think one on four is a dogfall?
Rooster Cogburn: I mean to kill you in one minute, Ned. Or see you hanged in Fort Smith at Judge Parker's convenience. Which'll it be?
Ned Pepper: I call that bold talk for a one-eyed fat man.
Rooster Cogburn: Fill your hands, you son of a bitch!

http://www.youtube.com/watch?v=wdAXjMj6mfU

Never thought it would come to pass, but Jeff Bridges is a better Rooster Cogburn than John Wayne. In the new version, you can almost smell the tobacco juice.