Romans 16:18

For such do not serve our Lord Christ, but their own stomach; and through fair speeches and eulogies deceive the hearts of the innocent.

James 1:8

the double-minded man, the most unstable in all his ways.

1 Thessalonians 2:5

For at that time we were not in word of flattery, as you know, nor in a pretext of covetousness, God is our 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 do not serve our Lord Christ, but their own stomach; and through fair speeches and eulogies deceive the hearts of the innocent.
1 Thessalonians 2:5
For at that time we were not in word of flattery, as you know, nor in a pretext of covetousness, God is our witness;

General references

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