I have stumbled on this quote in Lord of the Rings, the Fellowship of the Ring. Here is the scene. It's around 1 minute and 44 seconds.
Boromir: What chance do you think you have? They will find you. They will take the Ring. And you will beg for death before the end! [Frodo tries to walk away] You fool! It is not yours, save by unhappy chance! It could have been mine! It should be mine! [pins Frodo to the ground] Give it to me! GIVE IT TO ME!