Macbeth asks Banquo if he wants to go to his feast later that night and Banquo accepts but he would be there later since he plans to go for a ride on his horse.
We'll come to the feast but I already plan on going for a ride for a while
Would you like to come to our feast tonight?
Macbeth becomes jealous of Banquo and sends 3 murderers to kill Banquo and his son, Fleance, but Fleance escapes. After Banquo is killed, Macbeth has a feast with others noble but then he thinks he sees the ghost of Banquo there, which makes Macbeth look insane. A lord of Scotland named Lennox talks with another Lord in the ending scene of the act, which reveals that Malcolm fled to England to gain support to overthrow Macbeth
"Avaunt, and quit my sight! Let the earth hide thee. Thy bones are marrowless; thy blood is cold; thou hast no speculation in those eyes which thou dost glare with." (act 3 scene 4: 113-116)
Macbeth meets the 3 witches again, who show him 4 prophecies: Macbeth should be scared of Macduff, no one that is born can harm Macbeth, Macbeth won't be overthinking until the forest surrounding his marches, and that Banquo's kin will rule. Macbeth becomes bitter, sending murderers to kill Macduff's family. Lady Macbeth's guilt shows when she thinks that she sees a stain of blood on herself.
What are the meaning of the prophecies hags?
You'll see soon
Soldiers from both Scotland and England meet up and march against Macbeth's castle. Lady Macbeth killed herself and Macbeth marches out to fight the army but is killed by Macduff (who was not naturally born). And thus, the reign of terror by Macbeth is stopped and Malcolm is declared king.
"Hail King! Behold where stands th' usurper's cursed head. The time is free I see thee compassed with thy kingdom's pearl, that speaks my salvation in their minds, whose voice I desire aloud with mine. Hail, King of Scotland (5:8:65-70)