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Matthew 10:22: but whoever endures to the end will be saved.
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Romans 11:22: Note then the kindness and the severity of God: severity toward those who have fallen, but God’s kindness to you, provided you continue in his kindness. Otherwise you too will be cut off.
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1 Corinthians 9:25-27: Every athlete exercises self-control in all things. They do it to receive a perishable wreath, but we an imperishable. So I do not run aimlessly; I do not box as one beating the air. But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.
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1 Corinthians 10:12:Therefore, whoever thinks he is standing secure should take care not to fall.
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Galatians 5:4: You are severed from Christ, you who would be justified by the law; you have fallen away from grace.
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2 Peter 2:20: For if, after they have escaped the defilements of the world through the knowledge of our Lord and Savior Jesus Christ, they are again entangled in them and overcome, the last state has become worse for them than the first.
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Colossians 1:21-23: And you, who once were alienated and hostile in mind, doing evil deeds, he has now reconciled in his body of flesh by his death, in order to present you holy and blameless and above reproach before him, if indeed you continue in the faith, stable and steadfast, not shifting from the hope of the gospel that you heard, which has been proclaimed in all creation under heaven, and of which I, Paul, became a minister.
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Hebrews KJV:Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end.
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Revelation 3:2-5: "Wake up, and strengthen what remains and is about to die, for I have not found your works complete in the sight of my God. Remember, then, what you received and heard. Keep it, and repent. If you will not wake up, I will come like a thief, and you will not know at what hour I will come against you. Yet you have still a few names in Sardis, people who have not soiled their garments, and they will walk with me in white, for they are worthy. The one who conquers will be clothed thus in white garments, and I will never blot his name out of the book of life. I will confess his name before my Father and before his angels."
Perseverance of the saints - Wikipedia