Romans 14:23

23. And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.

Galatians 5:19-21

19. Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,

20. Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,

21.envy, murders, drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told you in time past, that those who practice such things will not inherit the kingdom of God.

James 4:17

17. Therefore to him that knoweth to do good, and doeth it not, to him it is sin.

1 John 3:4

4. Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.