Respuesta :
Although I'm not 100% sure, I'm 90% sure that it's Balthasar's second line. When he tells Romeo to not be hasty because he looks 'pale and wild' and fears that this will harm his well being, he is foreshadowing Romeo's death.
Dramatic Irony is when the audience knows something the characters don't.
Therefor the answer is "Hast thou no letters to me from the friar?" this is the answer because there is a letter from the friar but the person who is supposed to deliver it and tell Romeo that Juliet isn't dead has fallen ill. We as the audience know there is a letter but the characters don't, and sadly will never know there was one.