This verse serves to indicate that all the families of Israel, not just the northern kingdom, as may be concluded from 30.22, will be the LORD’s people. (In the Septuagint 30.22 is omitted, perhaps because it was felt unnecessary in light of this verse.)

Families is first used in 1.15 (Revised Standard Version “tribes”). See also 2.4; 3.14; 8.3; 10.25 (Revised Standard Version “peoples”); 15.3 (Revised Standard Version “kinds”); 25.9 (Revised Standard Version “tribes”); 33.24.

Says the LORD: See 1.8.

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 .