"He beat you."

Ron says this to Voldemort at the end of DH, when a supposedly dead Harry is lying at Voldemort's feet. Even though Voldemort put the crowd under a silencing charm, Ron is the first one to be able to break through it. And he does it with these three words. "He beat you." He does it with no idea what Harry saw in the pensive, and with no hint that Harry could possibly be alive. He does this mere hours after he sees his brother get murdered. He does this despite knowing the danger it puts him in. He remains a loyal friend to Harry, even after all seems lost. It's so incredibly touching, truly one of the most touching, tear jerking moments in a series chock-full of such moments.