Her treacherous sister Judith - These words are a sort of refrain, thrice Jeremiah 3:7-8, Jeremiah 3:10 repeated before God finally pronounces Judah more culpable than Israel.
Related Commentaries of Jeremiah 3:10
Jeremiah 3:10
10 And yet for all this her treacherous sister Judah hath not turned unto me with her whole heart, but feignedly,c saith the LORD.