'Evil' in the Bible

Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.

But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.

Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.