Acts 20:31

So be on the alert, remember how for three whole years I never ceased night and day to watch over each one of you with tears.

Matthew 24:24-25

for false Christs and false prophets will rise and bring forward great signs and wonders, so as to mislead the very elect, ??if that were possible.

1 Corinthians 4:14

I do not write this to make you feel ashamed, but to instruct you as beloved children of mine.

1 Corinthians 10:12

So let anyone who thinks he stands secure, take care in case he falls.

Galatians 1:6-10

I am astonished you are hastily shifting like this, deserting Him who called you by Christ's grace and going over to another gospel.

Galatians 2:11-13

But when Cephas came to Antioch, I opposed him to his face. The man stood self-condemned.

Galatians 5:2-7

Here, listen to Paul! I tell you, if you get circumcised, Christ will be no use to you.

Ephesians 4:17-21

Now in the Lord I insist and protest that you must give up living like pagans; for their purposes are futile,

Ephesians 5:5-6

Be sure of this, that no one guilty of sexual vice or impurity or lust (that is, an idolater) possesses any inheritance in the realm of Christ and God.

Colossians 1:28

This is the Christ we proclaim; we train everyone and teach everyone the full scope of this knowledge, in order to set everyone before God mature in Christ;

Colossians 3:5-8

So put to death those members that are on earth: sexual vice, impurity, appetite, evil desire, and lust (which is idolatry),

1 Thessalonians 5:14

We beseech you, brothers, keep a check upon loafers, encourage the faint-hearted, sustain weak souls, never lose your temper with anyone;

1 Timothy 4:16

Watch yourself and watch your teaching; stick to your work; if you do that, you will save your hearers as well as yourself.

Titus 2:15

Tell them all this, exhort and reprove, with full authority; let no one slight you.

James 5:20

understand that he who brings a sinner back from the error of his way saves his soul from death and hides a host of sins.

1 John 3:6-9

anyone who remains in him does not sin ??anyone who sins has neither seen nor known him.

Revelation 3:19

I reprove and discipline those whom I love; so be in warm 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
But when Cephas came to Antioch, I opposed him to his face. The man stood self-condemned.
James 5:20
understand that he who brings a sinner back from the error of his way saves his soul from death and hides a host of sins.

Also

1 Timothy 4:16
Watch yourself and watch your teaching; stick to your work; if you do that, you will save your hearers as well as yourself.