וַיֹּ֨אמֶר יְהוָ֜ה אֵלַ֗י בִּימֵי֙ יֹאשִׁיָּ֣הוּ הַמֶּ֔לֶךְ הֲֽרָאִ֔יתָ אֲשֶׁ֥ר עָשְׂתָ֖ה מְשֻׁבָ֣ה יִשְׂרָאֵ֑ל הֹלְכָ֨ה הִ֜יא עַל־כָּל־הַ֣ר גָּבֹ֗הַּ וְאֶל־תַּ֛חַת כָּל־עֵ֥ץ רַעֲנָ֖ן וַתִּזְנִי־שָֽׁם׃
И сказал мне Господь во дни царя Иосии: 'Видел ли ты то, что сделал отступник? она поднялась на каждую высокую гору и под каждое лиственное дерево, и там играла блудница.
Rashi
the backsliding of My people Heb. שְׁבוּת, an expression of the straying of youth and childhood, anwejjsdoure in O.F. Comp. (Jer. 3:14) “backsliding children (שוֹבָבִים)”; (ibid. 31:21) “backsliding daughter (הַבַּת הַשׁוֹבֵבָה).”
From David to Destruction
It seems that the soldiers are not particularly thorough in their searches, as they seem to carry out royal decrees perfunctorily and without much enthusiasm. This also explains how the Bnei Yisrael deserved the Churban not so long after Yoshiyahu’s death. Yoshiyahu’s reformations seem to have little impact on the people’s hearts. They merely cooperate in the removal of public idolatry. Finally, this also explains why Yirmiyahu castigates Am Yisrael even during Yoshiyahu’s period of reformation (see Yirmiyahu 3:6-10 and 25:3).