In his testimonies to the church, Jeremiah constantly referred to the teachings of the book of the law that had been so greatly honored and exalted during Josiah's reign. He emphasized anew the importance of maintaining a covenant relationship with the all-merciful and compassionate 429 Being who upon the heights of Sinai had spoken the precepts of the Decalogue. Jeremiah's words of warning and entreaty reached every part of the kingdom, and all had opportunity to know the will of God concerning the nation.

Når Jeremias talte til menigheden, henviste han ustandselig til, hvad der stod i lovbogen, som var blevet værdsat så højt under Josias regering. Han understregede på ny vigtigheden af at holde pagten med den nådige og barmhjertige Gud, som havde forkyndt de ti bud på Sinaj bjerg. Jeremias advarsler og appeller blev Hørt i alle dele af riget, og alle fik lejlighed til at lære Guds vilje med nationen at kende.