1 Peter 5:8-10
Be sober, be vigilant: your adversary, the devil, is walking about as a roaring lion, seeking whom he may devour:
2 Peter 1:10-12
Wherefore, the rather, brethren, earnestly endeavor to make your calling and election sure; for doing these things, you shall never fall;
2 Peter 3:14
Wherefore, beloved, expecting these things, diligently endeavor to be found of him spotless, and irreproachable, in peace.
2 Peter 3:17-18
Therefore, beloved, foreknowing these things, be on your guard; lest being also carried away by the deceit of the lawless, you fall from your own steadfastness.
1 John 2:1-2
My little children, these things I write to you, that you may not sin. Yet if any one has sinned, we have an advocate with the Father, Jesus Christ the Just One.
1 John 2:19
They went away from us, but they were not of us. For, if they had been of us, they would have abode with us; but they went away, that they might be made manifest that they were not of us.