Romans 16:18

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

James 1:8

a doubleminded man as he is, unstable in all his ways.

1 Thessalonians 2:5

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

General references

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