You must have a black candle which you light. Pick up the black candle and say 8 times on eight consecutive days:

"NAME*
xAbuse of me must stop,
xHurting me must stop.
xNAME* must go out of my sight."

As the flame burns down, say:

"All NAME's power over me has gone. I shall be free from harm."

On the 8th day, after finishing the ritual, wrap the black candle in a black serviette and bury it.

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*NAME is the person who is abusing you.