Proverbs 2:13 (KJV 1900) — 13 Who leave the paths of uprightness, To walk in the ways of darkness;
The first characteristic of evil persons is that they walk in darkness. There is no middle ground between good and evil. A person either walks in the light or in the darkness.
1 John 1:6–7 (KJV 1900) — 6 If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth: 7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.