Is not this a type of the Jewish and Gentile churches?
Related Commentaries of Genesis 38:26
Genesis 38:26-27
26 And Judah acknowledged them, and said, She hath been more righteous than I; because that I gave her not to Shelah my son. And he knew her again no more.
27 And it came to pass in the time of her travail, that, behold, twins were in her womb.