Acts 20:31

be then upon the watch, and remember, that for three years I have not ceased by night, or by day to warn every soul of you, even with tears.

1 Thessalonians 5:14

and we exhort you, brethren, reprove the disorderly, comfort the pusillanimous, support the weak, and be patient toward all men.

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
be then upon the watch, and remember, that for three years I have not ceased by night, or by day to warn every soul of you, even with tears.
1 Thessalonians 5:14
and we exhort you, brethren, reprove the disorderly, comfort the pusillanimous, support the weak, and be patient toward all men.