At the end of ten days is more natural as “Ten days later” (New Jerusalem Bible, Good News Translation, Die Bibel im heutigen Deutsch).
The word of the LORD came to Jeremiah: See 1.4.
Quoted with permission from Newman, Barclay M. and Stine, Philip C. A Handbook on Jeremiah. (UBS Helps for Translators). New York: UBS, 2003. For this and other handbooks for translators see here .