1 Corinthians 6v18-20
Flee from sexual immorality. Every other sin a person commits is outside the body, but the sexually immoral person sins against his own body. Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price. So glorify God in your body.

These verses are always heavy hitters especially when concerning the tough topic of sexual sin. But there are two parts in these last verses of the chapter. The what and why. The what is the commandment of fleeing from sexual immorality which is incredibly important for us to live in respect to the Spirit in us but the why slams it home and brings it all together. We were bought with a price, with a death of a savior pure and innocent. Our bodies are not our own but are now in ownership with Christ and that is why we must flee, stay pure, and strive whole heartily to live as He has because He is alive in us.

We are not our own. We were bought with a price.