An excerpt from "Bible Word.org" entitled, "The Elder Shall Serve the Younger" by Bro. Mark, states: "When Jacob and Esau, who were twins, were born, Esau was born first, and Jacob came out grasping Esau’s heel. While in the womb, the two fetuses were quite rambunctious; the two nations were fighting even before birth. So Rebekah prayed and asked why. Yahweh answered and told her two separate nations were in the womb and the elder would serve the younger." This article may be viewed at: The Elder Shall Serve the Younger/bibleword.org
Reference: Romans 9:12