'Every Green Tree' in the Bible

For from of old I have broken your yoke, and burst your bands; and you said, I will not transgress; when upon every high hill and under every green tree you wander, playing the harlot.

The LORD said also unto me in the days of Josiah the king, Have you seen that which backsliding Israel has done? she has gone up upon every high mountain and under every green tree, and there has played the harlot.

Only acknowledge your iniquity, that you have transgressed against the LORD your God, and have scattered your favors to the strangers under every green tree, and you have not obeyed my voice, says the LORD.