Out, treacherous villain!
Thou call’st on him that hates thee. It was he
That made the overture of thy treasons to us,
Who is too good to pity thee.

– William Shakespeare

King Lear, Act 3, Scene 7. As Gloucester calls to his son Edmund for help, Regan reveals to Gloucester in this passage that it was actually Edmund who betrayed him (by disclosing that Gloucester was aiding Lear). She delights in telling Gloucester that Edmund hates him.