Acts 20:31

Therefore be on the alert; and remember that, night and day, for three years, I never ceased admonishing every one, even with tears.

Matthew 24:24-25

For there will rise up false Christs and false prophets, displaying wonderful signs and prodigies, so as to deceive, were it possible, even God's own People.

1 Corinthians 4:14

I am not writing all this to shame you, but I am offering you advice as my dearly-loved children.

1 Corinthians 10:12

So then let him who thinks he is standing securely beware of falling.

Galatians 1:6-10

I marvel that you are so readily leaving Him who called you by the grace of Christ, and are adhering to a different Good News.

Galatians 2:11-13

Now when Peter visited Antioch, I remonstrated with him to his face, because he had incurred just censure.

Galatians 5:2-7

Remember that it is I Paul who tell you that if you receive circumcision Christ will avail you nothing.

Ephesians 4:17-21

Therefore I warn you, and I implore you in the name of the Master, no longer to live as the Gentiles in their perverseness live,

Ephesians 5:5-6

For be well assured that no fornicator or immoral person and no money-grubber--or in other words idol-worshipper--has any share awaiting him in the Kingdom of Christ and of God.

Colossians 1:28

Him we preach, admonishing every one and instructing every one, with all possible wisdom, so that we may bring every one into God's presence, made perfect through Christ.

Colossians 3:5-8

Therefore put to death your earthward inclinations--fornication, impurity, sensual passion, unholy desire, and all greed, for that is a form of idolatry.

1 Thessalonians 4:6-8

and that in this matter there be no encroaching on the rights of a brother Christian and no overreaching him. For the Lord is an avenger in all such cases, as we have already taught you and solemnly warned you.

1 Thessalonians 5:14

And we exhort you, brethren, admonish the unruly, comfort the timid, sustain the weak, and be patient towards all.

1 Timothy 4:16

Be on your guard as to yourself and your teaching. Persevere in these things; for by doing this you will make certain your own salvation and that of your hearers.

Titus 2:15

Thus speak, exhort, reprove, with all impressiveness. Let no one make light of your authority.

James 5:20

let him know that he who brings a sinner back from his evil ways will save the man's soul from death and throw a veil over a multitude of sins.

1 John 3:6-9

No one who continues in union with Him lives in sin: no one who lives in sin has seen Him or knows Him.

Revelation 3:19

All whom I hold dear, I reprove and chastise; therefore be in earnest and repent.

Treasury of Scripture Knowledge

Summary

Nevertheless if thou warn the righteous man, that the righteous sin not, and he doth not sin, he shall surely live, because he is warned; also thou hast delivered thy soul.

Bible References

He shall

Galatians 2:11
Now when Peter visited Antioch, I remonstrated with him to his face, because he had incurred just censure.
James 5:20
let him know that he who brings a sinner back from his evil ways will save the man's soul from death and throw a veil over a multitude of sins.

Also

1 Timothy 4:16
Be on your guard as to yourself and your teaching. Persevere in these things; for by doing this you will make certain your own salvation and that of your hearers.