Acts 20:31

Therefore be alert, remembering that for three years I did not cease night and day to admonish each one with tears.

1 Thessalonians 5:14

And we urge you, brethren, admonish the idlers, encourage the fainthearted, help the weak, be patient with everyone.

Treasury of Scripture Knowledge

Summary

And what cause soever shall come to you of your brethren that dwell in their cities, between blood and blood, between law and commandment, statutes and judgments, ye shall even warn them that they trespass not against the LORD, and so wrath come upon you, and upon your brethren: this do, and ye shall not trespass.

Bible References

Warn them

Acts 20:31
Therefore be alert, remembering that for three years I did not cease night and day to admonish each one with tears.
1 Thessalonians 5:14
And we urge you, brethren, admonish the idlers, encourage the fainthearted, help the weak, be patient with everyone.