Christians may hear from time to time the admonishment to “abstain from all appearances of evil“.
What you hear is a quotation of a passage from Paul’s first letter to Thessalonica (1 Thess. 5:22). Only, we usually hear a misquote of sorts, or rather a misuse of a quote.
“Abstain from all appearances of evil” is the most commonly used quotation of the passage, from the King James Bible. Many people shoot off this quote as if it were some sort of proof to Christians that they should not do something because it “looks bad” to others.