'Evil' in the Bible

Therefore let us keep our festival not with old yeast nor with the yeast of what is evil and mischievous, but with bread free from yeast--the bread of transparent sincerity and of truth.

And in this they became a warning to us, to teach us not to be eager, as they were eager, in pursuit of what is evil.

Brethren, do not prove yourselves to be children in your minds. As regards evil, indeed, be utter babes, but as regards your minds prove yourselves to be men of ripe years.

Do not deceive yourselves: "Evil companionships corrupt good morals."