29, 30. O earth! earth! earth!--Jeconiah was not actually without offspring (compare Jer 22:28, "his seed"; 1Ch 3:17, 18; Mt 1:12), but he was to be "written childless," as a warning to posterity, that is, without a lineal heir to his throne. It is with a reference to the three kings, Shallum, Jehoiakim, and Jeconiah, that the earth is thrice invoked [BENGEL]. Or, the triple invocation is to give intensity to the call for attention to the announcement of the end of the royal line, so far as Jehoiachin's seed is concerned. Though Messiah (Mt 1:1-17), the heir of David's throne, was lineally descended from Jeconiah, it was only through Joseph, who, though His legal, was not His real father. Matthew gives the legal pedigree through Solomon down to Joseph; Luke the real pedigree, from Mary, the real parent, through Nathan, brother of Solomon, upwards (Lu 3:31).
      no man of his seed . . . upon the throne--This explains the sense in which "childless" is used. Though the succession to the throne failed in his line, still the promise to David (Ps 89:30-37) was revived in Zerubbabel and consummated in Christ.

JFB.