Genesis 38:28,29

When she travailed It should seem the birth was hard to the mother, by which she was corrected for her sin: the children also, like Jacob and Esau, struggled for the birthright, and Pharez, who got it, is ever named first, and from him Christ descended. He had his name from his breaking forth before his brother: this breach be upon thee The Jews, as Zarah, bid fair for the birthright, and were marked, as it were, with a scarlet thread, as those that came first; but the Gentiles, like Pharez, or a son of violence, got the start of them, by that violence which the kingdom of heaven suffers, and attained to the righteousness which the Jews came short of: yet when the fulness of time is come, all Israel shall be saved. Both these sons are named in the genealogy of our Saviour, Matthew 1:3, to perpetuate the story, as an instance of the humiliation of our Lord Jesus.