God join’d my heart and Romeo’s, thou our hands;
And ere this hand, by thee to Romeo seal’d,
Shall be the label to another deed,
Or my true heart with treacherous revolt
Turn to another, this shall slay them both.
– William Shakespeare
Romeo and Juliet, Act 4, Scene 1. Juliet threatens to commit suicide with the knife she is holding unless Friar Laurence can stop her marriage to Paris and re-unite her with Romeo. She points out that God joined her heart to Romeo’s. The end of the play when Juliet kills herself with a dagger is foreshadowed here.