Jeremiah 3:8

8 that for the adversary, Israel, did adultery, I had let go her, and I had given to her a libel, (or a little book,) of forsaking; and Judah, her sister, breaker of the law, dreaded not, but also she went, and did fornication. (that my adversary, Israel, had done adultery, and that I had let her go, and that I had given her a note of divorce; and her sister Judah, the law-breaker, did not fear, but she also went, and did fornication.)

Jeremiah 3:8 Meaning and Commentary

Jeremiah 3:8

And I saw, when for all the causes, whereby backsliding Israel
committed adultery
Not only Judah saw, but God, who sees all things, saw the idolatry of the ten tribes which apostatized from him, and all the springs, causes, reasons, and occasions of it, and its consequences; and also the treachery, hardness, and idolatry of Judah: I had put her away, and given her a bill of divorce;
as men did, when they put away their wives, as they might lawfully do in case of adultery; and here being that which answered to it, spiritual adultery or idolatry, the Lord, who was married to this people, put them away from him, and caused them to be carried captive out of their own land into another, ( 2 Kings 17:6 ) which is meant by the bill of divorce; so the Targum,

``I caused them to go into captivity, as those that give a bill of divorce (to their wives) and dismiss them:''

yet her treacherous sister Judah feared not;
to commit idolatry and offend the Lord, nor stood in awe of his righteous judgments; had no reverence of God, nor fear of punishment; so hardened and daring was she: but went and played the harlot; committed idolatry, as the ten tribes did, taking no warning by what befell them.

Jeremiah 3:8 In-Context

6 And the Lord said to me, in the days of Josiah, the king, Whether thou hast seen what thing the adversary, Israel, hath done? She went [away] to herself on each high hill, and under each tree full of boughs, and did fornication there. (And the Lord said to me, in the days of King Josiah, Hast thou seen what my adversary, Israel, hath done? She went upon each high hill, and under each tree full of branches, and she did fornication there.)

7 And I said, when she had done all these things, Turn thou again to me; and she turned not again. And her sister, Judah, breaker of the law, saw, (And I said to her, when she had done all these things, Return thou again to me; but she did not return. And her sister, Judah, the law-breaker, saw,)

8 that for the adversary, Israel, did adultery, I had let go her, and I had given to her a libel, (or a little book,) of forsaking; and Judah, her sister, breaker of the law, dreaded not, but also she went, and did fornication. (that my adversary, Israel, had done adultery, and that I had let her go, and that I had given her a note of divorce; and her sister Judah, the law-breaker, did not fear, but she also went, and did fornication.)

9 And by lightness of her fornication she defouled the earth, and did adultery with a stone, and with a tree. (And with the indifference of her fornication she defiled the land, and did idolatry with a stone, and with a piece of wood.)

10 And in all these things her sister, Judah, breaker of the law, turned not again to me, in all her heart, but in a leasing, saith the Lord God. (And in all these things her sister, Judah, the law-breaker, did not return to me, with all her heart, but in a lie, or falsely, saith the Lord God.)