The Hebrew text literally reads through the lightness of adultery.
Judah found it easy to follow in her sister’s footsteps because she saw her idolatry as light and insignificant.1 Again, as in Jeremiah 3:1, Judah has polluted the land
by “committing adultery with stone and tree," a reference to her pagan worship practices. We see again the close connection of Judah’s covenant faithfulness to the Lord with the land he had given her (Jeremiah 3:1–3).
9 Because she took her whoredom lightly, she polluted the land, committing adultery with stone and tree.