Acts 20:31

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

Matthew 24:24-25

For false Christs and false prophets shall arise and shew great signs and wonders, so that they would deceive (if it were possible) even the elect.

1 Corinthians 4:14

I do not write these things to shame you, but as my beloved children I warn you.

1 Corinthians 10:12

Therefore let him that standeth, take heed, lest he fall.

Galatians 1:6-10

I marvel that ye are so soon removed from Christ who called you by his grace to another gospel, Which is not another;

Galatians 2:11-13

But when Peter came to Antioch, I withstood him to the face, because he was to be condemned.

Galatians 5:2-7

Behold, I Paul say unto you, If ye be circumcised, Christ shall profit you nothing.

Ephesians 4:17-21

This therefore I say and testify in the Lord, that ye no longer walk as the rest of the Gentiles, in the vanity of your mind:

Ephesians 5:5-6

For this ye know, that no whoremonger, or unclean person, or covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and of God.

Colossians 1:28

Whom we preach, admonishing every man, and teaching every man, that we may present every man perfect through Christ Jesus.

Colossians 3:5-8

Mortify therefore your members which are upon the earth, fornication, uncleanness, inordinate affection, evil desire, and covetousness, which is idolatry:

1 Thessalonians 4:6-8

That none circumvent or defraud his brother in this matter, because the Lord is an avenger of all these things, as we have also told you before and testified.

1 Thessalonians 5:14

Now we exhort you, brethren, warn the disorderly, comfort the feeble-minded, support the weak, be long suffering toward all men.

1 Timothy 4:16

Take heed to thyself and to thy teaching: continue in them, for in so doing thou shalt save both thyself and them that hear thee.

Titus 2:15

These things speak and exhort, and rebuke with all authority: let no man despise thee.

James 5:20

Let him know, that he who converteth a sinner from the error of his way, shall save a soul from death, and shall hide a multitude of sins.

1 John 3:6-9

Whosoever abideth in him sinneth not; whosoever sinneth, seeth him not, neither knoweth him.

Revelation 3:19

Whomsoever I love, I rebuke and chasten: be zealous 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 Peter came to Antioch, I withstood him to the face, because he was to be condemned.
James 5:20
Let him know, that he who converteth a sinner from the error of his way, shall save a soul from death, and shall hide a multitude of sins.

Also

1 Timothy 4:16
Take heed to thyself and to thy teaching: continue in them, for in so doing thou shalt save both thyself and them that hear thee.