Romans 16:18

For such persons do not serve our Lord Christ, but their own appetites, and by smooth and flattering words they deceive the hearts of the simple.

James 1:8

being a double-minded man, unstable in all his ways.

1 Thessalonians 2:5

For, as you know, we never used flattery nor a pretext for greed God is witness

Treasury of Scripture Knowledge

Summary

They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak.

General references

Bible References

Flattering

Romans 16:18
For such persons do not serve our Lord Christ, but their own appetites, and by smooth and flattering words they deceive the hearts of the simple.
1 Thessalonians 2:5
For, as you know, we never used flattery nor a pretext for greed God is witness

General references

Acts 12:22
And the people shouted, "The voice of a god and not of a man!"