What to do when a narcissist turns people against you

The Lord has the answers in His Word what to do when we are harmed by the narcissists.

Proverbs 16:28
"A dishonest man spreads strife, and a whisperer separates close friends."

Proverbs 22:24-25
"Make no friendship with a man given to anger, nor go with a wrathful man, lest you learn his ways and entangle yourself in a snare."

1 John 4:1
"Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world."