Albert Barnes Commentary Jeremiah 2:20

"For of old time I have broken thy yoke, and burst thy bonds; and thou saidst, I will not serve; for upon every high hill and under every green tree thou didst bow thyself, playing the harlot." — Jeremiah 2:20 (ASV)

Transgress - Rather, as in the margin. If the “yoke” and “bands” refer to the slavery in Egypt from which Yahweh freed Israel, the sense is - “For long ago I Yahweh broke your yoke, I burst your bands,” not that you might be free to do your own will, but that you might serve me: “and you said, I will not serve.”

When ... - For ... under every leafy tree thou layest thyself down as a harlot. The verb indicates the eagerness with which she prostrates herself before the objects of her idolatrous worship.