Jeremiah 3:8 Kabbalah

וָאֵ֗רֶא כִּ֤י עַל־כָּל־אֹדוֹת֙ אֲשֶׁ֤ר נִֽאֲפָה֙ מְשֻׁבָ֣ה יִשְׂרָאֵ֔ל שִׁלַּחְתִּ֕יהָ וָאֶתֵּ֛ן אֶת־סֵ֥פֶר כְּרִיתֻתֶ֖יהָ אֵלֶ֑יהָ וְלֹ֨א יָֽרְאָ֜ה בֹּֽגֵדָ֤ה יְהוּדָה֙ אֲחוֹתָ֔הּ וַתֵּ֖לֶךְ וַתִּ֥זֶן גַּם־הִֽיא׃

And I saw, when, forasmuch as backsliding Israel had committed adultery, I had put her away and given her a bill of divorcement, that yet treacherous Judah her sister feared not; but she also went and played the harlot;

Read kabbalistic (mystical) interpretation of Jeremiah 3:8: and classical mystical sources.