100
In the beginning of Act 4, Friar Laurence and County Paris are speaking in the church then Juliet comes along asking to speak to the Friar alone. After Paris leaves, Juliet asks Friar Lawrence for help, brandishing a knife and saying that she will kill herself rather than marry Paris. The friar proposes a plan:
What is to take a poison that will Juliet into a deep sleep, almost as if she is dead. Her "dead" body will be put into the Capulet vault and when she awakes Romeo will be there and they will escape together.