It's in Macbeth by William Shakespeare, Act One Scene One. The Witches on the heath say the lines.
The lines "Double, double toil and trouble; Fire burn and cauldron bubble" are from William Shakespeare's play "Macbeth". They are spoken by the three witches as they create a potion in Act 4, Scene 1.
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The couplet repeated by the witches in their chant is "Double, double toil and trouble; Fire burn and cauldron bubble."
The witches say "Double, double toil and trouble; Fire burn and cauldron bubble" in Shakespeare's play Macbeth to invoke a spell while brewing a potion in a cauldron. The repetition of words and phrases in poetry and spells was a common literary device during Shakespeare's time to create rhythm and emphasis.
The witches from Shakespeare's play, Macbeth. This is the chorus while they are dropping ingredients into their cauldron.
double double toil and trouble
The three witches recite this line at the beginning of the play (Macbeth reiterates it later in the play). They also recite "toil and trouble, Cauldron boil and cauldron bubble."
bubble trouble double rubble
Double Bubble, toil and trouble
Bubble, bubble, toil and trouble, is a quote from Shakespeare. The witches that MacBeth visits chant this, around a steaming cauldron. As to the actual spell, it seems to be related to their ability to predict the future. Whether modern witchcraft uses this, I have no idea. From the "spells" that some modern witches use, it seems likely. To quote Cecil "El retardo supremo, if you want an opinion."
It's a very famous monologue in Shakespeare's Macbeth, spoken by the Three Witches.
Bubble,ruble,double,trouble,and so on