Read Jeremiah 3:9 Using Other Translations
And it came to pass through the lightness of her whoredom, that she defiled the land, and committed adultery with stones and with stocks.
Because she took her whoredom lightly, she polluted the land, committing adultery with stone and tree.
Israel treated it all so lightly—she thought nothing of committing adultery by worshiping idols made of wood and stone. So now the land has been polluted.