Acts 20:31

Therefore watch, remembering that for three years, by night and by day, I have never ceased with tears to admonish every individual.

Matthew 24:24-25

for false Messiahs and false prophets shall arise, and give out great signs and wonders; so as to deceive, if it were possible, even the elect.

1 Corinthians 4:14

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

1 Corinthians 10:12

Wherefore let him that thinketh he standeth, take heed lest he fall.

Galatians 1:6-10

I marvel that ye are so quickly departed from him that called you, by the grace of Christ into another gospel

Galatians 2:11-13

But when Peter came to Antioch I withstood him to his face, because he was blameable.

Galatians 5:2-7

Behold, I Paul declare to you, that if ye be circumcised, Christ will be of no advantage to you.

Ephesians 4:17-21

This then I urge and testify in the Lord, that ye walk no more as the other Gentiles walk in the vanity of their mind,

Ephesians 5:5-6

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

Colossians 1:28

whom we preach, warning every man, and teaching every man in all wisdom, that we may present every man perfect in Christ Jesus;

Colossians 3:5-8

Mortify therefore your members which are on the earth, fornication, impurity, the vile passion, evil concupiscence, and insatiable desire, which is idolatry:

1 Thessalonians 4:6-8

that no man transgress against, or act dishonestly to his brother in this matter because the Lord is the avenger of all such things, as we have told you before, and testified.

1 Thessalonians 5:14

Now we conjure you, brethren, admonish the unruly, comfort the feeble-minded, support the infirm, be patient with all men.

1 Timothy 4:16

Take heed unto thyself, and to thy doctrine; abide in them: for so doing thou shalt both save thyself, and those who hear thee.

Titus 2:15

These things speak and enjoin, and reprove with all authority. Let no man despise thee.

James 5:20

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

1 John 3:6-9

Every one who abideth in him, doth not sin; every one who sinneth hath not seen him, nor known him.

Revelation 3:19

As many as I love, I rebuke and correct: be zealous then, 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 his face, because he was blameable.
James 5:20
let him know, that he that converteth a sinner from the error of his way will save a soul from death, and will cover a multitude of sins.

Also

1 Timothy 4:16
Take heed unto thyself, and to thy doctrine; abide in them: for so doing thou shalt both save thyself, and those who hear thee.