The New Moon brings fresh opportunities and an expansion of present prosperity and luck. Your chosen course of action for future accomplishments become increasingly bright and clear. Good forces end disagreements. Positive action you take brings positive results.
When the Moon is new, appearing as a crescent in the sky with its curve to the right, light a silver or white candle. Place a hand-mirror in front of the candle and dap the four corners of the mirror with vinegar. Stand outside and reflect the new moon in the mirror, or hold the mirror up to reflect the new moon in the mirror or hold the mirror up to reflect the flame. Then say:
"New Moon, growing moon, make (person's name) realize soon, Harm sent and misery cursed, is returned and being reversed."
The harm this person has caused you will increasingly return to them while the new moon grows to full moon.
*** Most Witches cast good spells, but it may be right to cast a spell on one who needs to be checked for continually doing wrong. You can turn your magic around to counteract one who wishes to do harm.
Taken from: Gillian Kempt - Good Witch Bad Witch - Sweet Spells and Dark Charms