Proverbs 26:28
"A lying tongue hateth those that are afflicted by it; and a flattering mouth worketh ruin."
Cross References (ranked by relevance)
Proverbs 29:5
A man that flattereth his neighbour spreadeth a net for his feet.
Proverbs 6:24
To keep thee from the evil woman, from the flattery of the tongue of a strange woman.
Proverbs 7:5
That they may keep thee from the strange woman, from the stranger which flattereth with her words.
John 8:40
But now ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham.