1 Peter 2:11-12 ESV
Beloved, I urge you as sojourners and exiles to abstain from the passions of the flesh, which wage war against your soul. Keep your conduct among the Gentiles honorable, so that when they speak against you as evildoers, they may see your good deeds and glorify God on the day of visitation.
Galatians 5:19-21 NASB
Now the deeds of the flesh are evident, which are: immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions, envying, drunkenness, carousing, and things like these, of which I forewarn you, just as I have forewarned you, that those who practice such things will not inherit the kingdom of God.
2 Timothy 2:22 NASB
Now flee from youthful lusts and pursue righteousness, faith, love and peace, with those who call on the Lord from a pure heart.
Peter lays out 2 reasons we must abstain from fleshly passions
1. We are only temporary residents (Sojourners, exiles)
2. We are walking billboards