Romans 16:18

For such serve not our Lord Christ, but their own appetites; and, by good words and fair speeches, they deceive the hearts of the simple.

James 1:8

A double-minded man is unstable in all his ways.

1 Thessalonians 2:5

For neither nattering words did we at any time use, as you know, nor a pretext for covetousness; 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 serve not our Lord Christ, but their own appetites; and, by good words and fair speeches, they deceive the hearts of the simple.
1 Thessalonians 2:5
For neither nattering words did we at any time use, as you know, nor a pretext for covetousness; God is witness:

General references

Acts 12:22
And the people shouted: It is the voice of God, and not of man.