That the land spue not you out also, when ye defile it, as it spued out the nations that were before you.

So if you defile the land, it will vomit you out as it spewed out the nations before you.

For whosoever shall commit any of these abominations, even the souls that commit them shall be cut off from among their people.

Therefore anyone who commits any of these abominations must be cut off from among his people.