Acts 20:31

Wherefore, watch, remembering that for three years, night and day, I ceased not to admonish every one with tears.

Matthew 24:24-25

for there will arise false Christs and false prophets; and they will give great signs and wonders, so as to lead astray, if possible, even the elect.

1 Corinthians 4:14

Not as shaming you, do I write these things, but as my beloved children, admonishing you.

1 Corinthians 10:12

Wherefore, let him who thinks he is standing take heed, lest he fall.

Galatians 1:6-10

I marvel that ye are so quickly removing from Him Who called you in the grace of Christ, to a different Gospel,

Galatians 2:11-13

But, when Cephas came to Antioch, I withstood him to the face, because he was blameworthy;

Galatians 5:2-7

Behold, I, Paul, say to you, that, if ye be circumcised, Christ will profit you nothing.

Ephesians 4:17-21

This, therefore, I say, and testify in the Lord, that ye no longer walk as the gentiles also walk, in the vanity of their mind,

Ephesians 5:5-6

For this ye know, assuredly, that no fornicator, nor unclean person, nor covetous man (who is an idolater), has any inheritance in the Kingdom of Christ and God.

Colossians 1:28

Whom we proclaim, warning every man, and teaching every man in all wisdom, that we may present every man perfect in Christ;

Colossians 3:5-8

Make dead, therefore, your members which are upon the earth; fornication, uncleanness, passion, evil desire, and covetousness, which, indeed, is idolatry;

1 Thessalonians 4:6-8

that he go not beyond and gain an advantage over his brother in the matter; because the Lord is an avenger of all these things, as we also told you before, and solemnly testified.

1 Thessalonians 5:14

And we exhort you, brethren, admonish the disorderly, encourage the fainthearted, support the weak, be long-suffering toward all.

1 Timothy 4:16

Take heed to yourself, and to the teaching; continue in them; for, doing this, you will save both yourself and those who hear you.

Titus 2:15

These things speak and exhort and reprove with all authority. Let no one despise you.

James 5:20

let him know that he who converted a sinner from the error of his way, will save a soul from death, and cover a multitude of sins.

1 John 3:6-9

Every one that is abiding in Him sins not; whosoever sins has not seen Him nor known Him.

Revelation 3:19

As many as I love, I reprove and chasten. Be zealous, therefore, 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
But, when Cephas came to Antioch, I withstood him to the face, because he was blameworthy;
James 5:20
let him know that he who converted a sinner from the error of his way, will save a soul from death, and cover a multitude of sins.

Also

1 Timothy 4:16
Take heed to yourself, and to the teaching; continue in them; for, doing this, you will save both yourself and those who hear you.