Why does the bible say "Thou shalt not suffer a witch to live"?

"Thou shalt not suffer a witch to live" , Exodus 22:18. I am a good person with a good heart. I have never intentionally harmed anyone, yet for my beliefs, I could be killed. I just don't understand why this should happen to anyone.

Why does the bible say Thou shalt not suffer a witch to live?
Why does the bible say "Thou shalt not suffer a witch to live"?
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