Acts 20:31

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

Matthew 24:24-25

For false Christs and false prophets will arise, and will show great signs and wonders, so as to deceive, if possible, even the elect.

1 Corinthians 4:14

I do not write these things that I may make you ashamed; but as my beloved children I admonish you.

1 Corinthians 10:12

"Wherefore, let him that thinks he stands, take heed lest he foil.

Galatians 1:6-10

I am astonished that you are so soon turning away from him that called you into the grace of Christ, to another gospel:

Galatians 2:11-13

But when Peter came to Antioch, I openly opposed him, because he had incurred blame.

Galatians 5:2-7

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

Ephesians 4:17-21

This I say, therefore, and appeal to you solemnly in the Lord, that you no longer walk as the other Gentiles walk, in the error of their minds,

Ephesians 5:5-6

For you know this, that no lewd nor unclean person, nor covetous man, who is an idolater, has any inheritance in the kingdom of the 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

Put to death, therefore, your members that are on the earth, lewdness, uncleanness, passion, evil desire, and covetousness, which is idolatry;

1 Thessalonians 4:6-8

That no one take advantage of or injure his brother in this matter; because the Lord takes vengeance for all such things, as we also told you before, and fully testified:

1 Thessalonians 5:14

We exhort you, brethren, admonish the unruly, comfort the faint-hearted, earnestly care for the weak-minded, be of a long-suffering disposition toward all.

1 Timothy 4:16

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

Titus 2:15

Speak these things, and exhort and rebuke with all strictness. Let no one despise you.

James 5:20

let him know that he who turns back 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

Whoever abides in him, sins not. Whoever sins, has neither seen him nor known him.

Revelation 3:19

As many as I love, I rebuke 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 Peter came to Antioch, I openly opposed him, because he had incurred blame.
James 5:20
let him know that he who turns back 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 your teaching; continue in them; for by doing this, you will save both yourself, and those who hear you.