Pronoun 'my' to tempt bear connotation of satanic imagery of snake in the garden of Eden and cause fall of man so the witches form their own anti trinity
Pathetic fallacy dark and foreboding atmosphere foreshadow tragic event. The fact the witches were first introduce highlight their importance as supernatural creatures whose main purpose is to create chaos and destroy cosmic order through their cryptic prophecies.
Lot of plosive sounds 'o' 'e' 'b' create a thumping sound almost as if an earthquake and are shifting natural order emphasising their undeniable power.
Furthermore Repetition of 'double' hold great importance serves as a reminder that their speeches are full of intricate double meaning contradictions and deception.
Rhyming couplet make it like a children nursery rhyme and paint mockery of the witches showing only weak fall for the witches power.
Witches operate in a realm where Macbeth cannot see them can be a sign to him of equivocation that the witches are hiding things leading to his downfall.
Historical religious belief that when one is baptised he is given a name sanctioned by God so this show their actions aren't holy.
Rule of three is implored this show the witches create their own anti-trinity especially as they speak in unison. Adjective 'black ' is unforgiving the witches are powerful being with no moral compass and 'midnights is the darkness time of night this show their actions cannot be brought to light. Exclamatory sentence show his disgust with them as their disruptive forces who act in 'secret' not to be trusted