2 Corinthians 2:11

for your sakes, that I may not be overreached by Satan, for I am not ignorant of his devices.

2 Corinthians 11:13-15

For such fellows are sham apostles of Christ.

Ephesians 6:11

Put on all the panoply of God, so that you may be able to stand your ground against the stratagems of the devil.

2 Thessalonians 2:10

and with all deceit of unrighteousness for those who are perishing, because they did not receive the love of the truth for their salvation.

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
for your sakes, that I may not be overreached by Satan, for I am not ignorant of his devices.
2 Corinthians 11:13
For such fellows are sham apostles of Christ.
Ephesians 6:11
Put on all the panoply of God, so that you may be able to stand your ground against the stratagems of the devil.
2 Thessalonians 2:10
and with all deceit of unrighteousness for those who are perishing, because they did not receive the love of the truth for their salvation.