Prohibitions on Necromancy and Spirits

What is the prominence of idolatrous warnings in our chapter?

Why do we hear - twice - a list of abhorrent sexual practices?

And how does this relate to "Hukot Hagoy" - the notion of the ambient culture of Canaan.

Today we explain the unit of ch.18-20 and what it seeks to say about the Torah's ethical lifestyle in contrast to the degenerate ways of the Canaanite nations.