In this scene the three witches were casting a spell  there are adding loads of different liquids and materials to the cauldron they are making a cure to help Macbeth because of his old age and he is very sick Macbeth needs a new king to be ale over for him the witches created a son for Macbeth and lady Macbeth.”time” Macbeth says to Macduff

 

Macbeth gives the witches some props for being able to control the weather and conjure crazy winds that batter churches, cause huge ocean waves to “swallow” ships, destroy crops, topple castles, and so on. (Hmm…this reminds us of Act I, scene iii, where the witches say they’re going to punish a sailor’s wife by whipping up a nasty little storm for her husband, who is at sea.)
Macbeth says he has some more questions about his future and he wants some answers from the weird sisters, pronto.
The witches add some more ingredients to the cauldron, and then apparitions begin to appear, each addressing Macbeth.
First, an armed head warns him to beware of Macduff. Second, a bloody child promises, “None of woman born shall harm Macbeth.” Macbeth welcomes this good news and, assuming Macduff was born the natural way, Macbeth thinks he has nothing to fear.