'Defile the Land' in the Bible

Therefore do not defile the land that you will inhabit, in which I live, for I the Lord live among the Israelites."

"If a man divorces his wife and she leaves him and becomes another man's wife, he may not take her back again. Doing that would utterly defile the land. But you, Israel, have given yourself as a prostitute to many gods. So what makes you think you can return to me?" says the Lord.