Act 5, Scene 3 is the scene where Romeo and Juliet die. The lines spoken are:

Juliet:
O comfortable friar! where is my lord?
I do remember well where I should be,
And there I am. Where is my Romeo?

Friar Lawrence:
I hear some noise. Lady, come from that nest
Of death, contagion, and unnatural sleep:
A greater power than we can contradict
Hath thwarted our intents. Come, come away.
Thy husband in thy bosom there lies dead;
And Paris too. Come, I'll dispose of thee
Among a sisterhood of holy nuns:
Stay not to question, for the watch is coming;
Come, go, good Juliet,—I dare no longer stay.

Juliet:
Go, get thee hence, for I will not away.
What's here? a cup, closed in my true love's hand?
Poison, I see, hath been his timeless end:
O churl! drunk all, and left no friendly drop
To help me after? I will kiss thy lips;
Haply some poison yet doth hang on them,
To make die with a restorative.
Thy lips are warm.

[Enter Watch, with the Page of PARIS]

Watch:
Lead, boy: which way?

Juliet:
Yea, noise? then I'll be brief. O happy dagger!
[Snatching ROMEO's dagger.]
This is thy sheath; [Stabs herself] there rest, and let me die.

What numbers are these lines in the book Romeo and Juliet??

These lines are in Act 5, Scene 3 and start from line 129 to 170.

These lines are spoken in Act 5, Scene 3 of the book "Romeo and Juliet." Specifically, Juliet's lines start at line 161 and go until line 177, while Friar Lawrence's lines start at line 184 and end at line 193. The Watch enters at line 195, and Juliet's final lines begin at line 199 and go until line 206.