Romans 16:18

for such serve not our anointed Lord, but themselves, And by kind and complimentary words deceive the minds of the simple.

James 1:8

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

1 Thessalonians 2:5

For we used at no time a word of flattery, 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 anointed Lord, but themselves, And by kind and complimentary words deceive the minds of the simple.
1 Thessalonians 2:5
For we used at no time a word of flattery, 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 a god, and not of a man.