Scene 1: 3 Witches are preparing a spell to cast on Macbeth at the beginning of Act 4. Hecate approves of their work. MAcbeth goes to the witches for help
Double, double toil and trouble; fire burn, and cauldron bubble
Scene 1: The witches show Macbeth an armed head that tells him to beware Macduff, bloody baby that tells him that he cannot be defeated by by no one born of a women, and a crowned baby that tells him that he will be safe until the woods move.
How now, you secret black and midnight hags, What is it you do?
Lennox informs that Macbeth that Macduff has joined Malcolm in England. That makes Macbeth mad and decides to go to Macduff castle and kill everyone in it
Tis two or three my lord, that brings you word Macduff is fled to England.
Lady Macduff is unhappy that her husband for abandoning them. Ross is revealed to be Lady Macduffs cousin. After their conversation Macbeth kills everybody.
He has killed me mother; Runaway I pray you.
Macduff is trying to convince Malcolm to attack Scotland and take his title back from Macbeth. Malcolm denies Macduffs offer because he is to greedy and he will spend time chasing women. He will be worse then Machbeth.
I grant him bloody luxurious, avaricious, false, deceitful, sudden, malicious, smacking of every sin that has a name: but there's no bottom, none in my voluptuousness: your wives , your daughters, your matrons and your maids, could not fill up the cistern of my lust, and my desire all continent impediments would o'erbear that did oppose my will: better Macbeth than such an one to reign
Macduff gets angry at Malcolm and Malcolm reveals that he was lying to test Macduff's loyalty. Ross arrives in England and informs Macduff of the tragedy that has happened at his castle
Macduff, this noble passion, child of integrity, hath from my soul wiped the black scruples reconciled my thoughts to thy good truth and honour