God chose a particular people, the Jews, to carry His message to the world. Then He chose a specific land, Israel, upon which to put His name. He determined that one day all the nations would come to that land to worship Him.
To fulfill that destiny both the land and the people had to be holy.
Now the Lord spoke to Moses in the plains of Moab by the Jordan, across from Jericho, saying, “Speak to the children of Israel, and say to them: ‘When you have crossed the Jordan into the land of Canaan, then you shall drive out all the inhabitants of the land from before you, destroy all their engraved stones, destroy all their molded images, and demolish all their high places; you shall dispossess the inhabitants of the land and dwell in it, for I have given you the land to possess.
PROCLAIM THAT BOTH THE LAND AND THE PEOPLE OF ISRAEL WILL SOON BE HOLY.