John Lightfoot on Matthew 1:12

[Jechonias begat Salathiel.] That is, "a son of the kingdom," or successor in that dignity of the house of David, whatsoever it was, which was altogether withered in the rest of the sons of Josiah, but did somewhat flourish again in him, 2 Kings 25:27. And hence it is, that of all the posterity of Josiah, Jechonias only is named by St. Matthew.

Jechonias, in truth, was without children, Jeremiah 22:30; and Salathiel, properly speaking, was the son of Neri, Luke 3:27: but yet Jechonias is said to beget him; not that he was truly his father, but that the other was his successor; not, indeed, in his kingly dignity, for that was now perished, but in that which now was the chief dignity among the Jews. So 1 Chronicles 3:16, Zedekias is called the son, either of Jehoiakim, whose brother indeed he was, or of Jechonias, whose uncle he was; because he succeeded him in the kingly dignity.

The Lord had declared, and that not without an oath, that Jechonias should be without children. The Talmudists do so interpret "R. Judah saith, All they of whom it is said, These shall be without children; they shall have no children. And those of whom it is said, They shall die without children; they bury their children." [Lev 20:2021.]

So Kimchi also upon the place; "The word (saith he) means this; That his sons shall die in his life, if he shall now have sons: but if he shall not now have sons, he never shall. But our Rabbins of blessed memory say, That he repented in prison. And they say moreover, Oh! how much doth repentance avail, which evacuates a penal edict! for it is said, 'Write ye this man childless': but, he repenting, this edict turned to his good," &c. "R. Jochanan saith, His carrying away expiated. For when it is said, 'Write this man childless,' after the carrying away it is said, 'The sons of Coniah, Assir his son, Shealtiel his son.'" These things are in Babyl. Sanhedrim, where these words are added, "Assir his son, because his mother conceived him in prison."

But the words in the original (1 Chron 3:17) are these...Now the sons of Jechonias bound [or imprisoned] were Shealtiel his son. Which version both the accents and the order of the words confirm...