An excerpt from "For What Saith The Scriptures.org" entitled, "Jacob Have I Loved, But Esau Have I Hated?" by Shawn Brasseaux, states: "The Prophet Malachi wrote about 400 B.C., over 1,000 years after Esau and Jacob had died. Malachi was not referring to the two men individually, but rather their descendants, the nations that originated in them. The context—in Malachi 1:2-3 or Romans 9:13—is not individuals but rather nations. Malachi is addressing Israel, a nation, God’s special nation. Go back to God’s words to Rebekah in Genesis 25:23: “And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger.” This is talking about how Jacob’s nation (Israel) will rule over Esau’s nation (Edomites). God, as per the Abrahamic Covenant, has chosen Israel as His chief nation in the Earth. Israel is to be His channel of salvation and blessing to the nations of the world. If Esau’s descendants are to partake of the salvation and blessings of the God of creation, they must come to Him through His nation, Israel. The Edomites have to bless (serve, submit to) Israel if they are to be blessed of God." This article may be viewed at: Jacob Have I Loved, But Esau Have I Hated?"/forwhatsaiththescriptures.org
Reference: Romans 9:13