Proverbs 26:25

When he speaketh fair, believe him not
Gives good words, flatters with his lips, pretends great kindness and favour, expresses himself in a very gracious and amiable manner, in order to gain attention and respect; or when he delivers himself in a submissive and suppliant way, with great humility and deference; or in a mournful and pitiful strain, as if he had the most tender affection and concern; be not too credulous; do not suffer yourselves to be imposed upon by him; be upon your guard, distrust him, suspect a snake in the grass; for [there are] seven abominations in his heart;
a multitude of wicked purposes, schemes, and designs, which he has formed there against you, and which he only waits a proper time to put in execution; things abominable to God and men. Aben Ezra thinks reference is had to the seven abominations in ( Proverbs 6:16 ) .