Jeremiah 31:33

We may compare, in support of Jeremiah's authorship, ch. Jeremiah 4:4 ("foreskins of your heart"); also Jeremiah 24:7. Moreover, the post-Jeremianic Isaiah 51:7 seems to be a reference to this passage.

I will put my law … heart thus securing that henceforward no complex system of ordinances will be needed. The inner life, emotional and intellectual alike, will be in full harmony with Jehovah's will.

and I will be … my people This relationship, existing under the Old Covenant, shall be restored, but with a new and permanent significance.