Do not set foot on the path of the wicked or walk in the way of evil men.  Avoid it, do not travel on it; turn from it and go on your way. For they cannot sleep till they do evil; they are robbed of slumber till they make someone fall. They eat the bread of wickedness and drink the wine of violence. The path of the righteous is like the first gleam of dawn, shining ever brighter till the full light of day.  But the way of the wicked is like deep darkness; they do not know what makes them stumble.

David is really trying to make a point to Solomon when he's talking about the way of evil men. When the bible says something once pay attention. When it says something twice pay close attention. When it says something three times, you should know that it really really means it.