2 Corinthians 2:11

[I do this] so that Satan cannot take advantage of us, for we are not unaware of his schemes.

2 Corinthians 11:13-15

For such men are false apostles; they are deceitful workers, who disguise themselves as [true] apostles of Christ.

Ephesians 6:11

You people should put on the full armor of God, so that you will be able to withstand the devil's schemes.

2 Thessalonians 2:10

and all kinds of wicked deception toward those people who are perishing [spiritually], because they refused to love the truth so they could be saved.

Treasury of Scripture Knowledge

Summary

Then sent Sanballat his servant unto me in like manner the fifth time with an open letter in his hand;

Bible References

With an open letter

2 Corinthians 2:11
[I do this] so that Satan cannot take advantage of us, for we are not unaware of his schemes.
2 Corinthians 11:13
For such men are false apostles; they are deceitful workers, who disguise themselves as [true] apostles of Christ.
Ephesians 6:11
You people should put on the full armor of God, so that you will be able to withstand the devil's schemes.
2 Thessalonians 2:10
and all kinds of wicked deception toward those people who are perishing [spiritually], because they refused to love the truth so they could be saved.