Deceptive speech.
v.23 Glaze on pottery. Like glaze on pottery, so smooth words may cover a wicked heart. Take care not to be fooled by the liar.
v.24-26 Smooth words. He who hates disguises his speech but harbors deceit in his heart. Don’t believe his speech for there are many evils in his heart. Though he may cover up his hatred with gracious words, his wickedness will ultimately be exposed to the community.
v.27 Fall into it. The man who digs a pit for his neighbor will fall into it. Never plot against others because it will fall upon yourself.
v.28 Lying tongue. A lying tongue hates its victims and a flattering tongue works ruin. Only pain and ruin will come from deception.

Read Proverbs 26:23-28