In which excerpt does Claudius tell Laertes of his plan to ensure Hamlet's death?
Good Laertes,
If you desire to know the certainty
Of your dear father's death, is't writ in your revenge,
That, swoopstake, you will draw both friend and foe,
Winner and loser?
(Hamlet Act IV, Scene V)

Why, now you speak
Like a good child and a true gentleman.
That I am guiltless of your father's death,
And am most sensible in grief for it,
It shall as level to your judgment pierce
As day does to your eye.
(Hamlet Act IV, Scene V)

Now must your conscience my acquaintance seal,
And you must put