2 Peter 3:17
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 Peter 5:9
whom resist, steadfast in the faith, knowing that the very same sufferings are accomplished in your brethren, who are in the world.
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 2:18-22
for, speaking great swelling words of falsehood, they allure by the lusts of the flesh, even by lasciviousness, those who have actually fled away from them who are living in error.
Revelation 2:5
Remember, therefore, from what you are fallen, and reform, and do the first works, otherwise I will come to you quickly, and take away your lamp out of its place, unless you reform.