Galatians 4:27 quotes this same barren-made-fruitful promise directly, applying it to the free children of the heavenly Jerusalem.
“Sing, barren, you who didn’t give birth; break out into singing, and cry aloud, you who did not travail with child: for more are the children of the desolate than the children of the married wife,” says Yahweh.
For it is written, “Rejoice, you barren who don’t bear. Break out and shout, you that don’t travail. For more are the children of the desolate than of her who has a husband.”
No commentary yet for this passage — the library is still growing here.