'Sin' in the Bible

Flee fornication. Every sin which a man may practise is without the body, but he that commits fornication sins against his own body.

But if any one think that he behaves unseemly to his virginity, if he be beyond the flower of his age, and so it must be, let him do what he will, he does not sin: let them marry.

Now, thus sinning against the brethren, and wounding their weak conscience, ye sin against Christ.

Awake up righteously, and sin not; for some are ignorant of God: I speak to you as a matter of shame.

Now the sting of death is sin, and the power of sin the law;