Romans 16:18

For those who are such are not serving our Lord Christ, but their own belly; and, through their kind words and flattering speeches, they beguile the hearts of the simple.

James 1:8

a double-souled man, unstable in all his ways.

1 Thessalonians 2:5

For neither, at any time, did we use a word of flattery, as ye know, nor a semblance 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 those who are such are not serving our Lord Christ, but their own belly; and, through their kind words and flattering speeches, they beguile the hearts of the simple.
1 Thessalonians 2:5
For neither, at any time, did we use a word of flattery, as ye know, nor a semblance of covetousness, God is witness;

General references

Acts 12:22
And the people were shouting, "It is the voice of a god, and not of a man!"