Isaac started trembling and said, “Then who brought me some wild meat just before you came in? I ate it and gave him a blessing that cannot be taken back.”
And because of what Jesus Christ has done, the blessing that was promised to Abraham was taken to the Gentiles. This happened so that by faith we would be given the promised Holy Spirit.
Long ago the Scriptures said that God would accept the Gentiles because of their faith. That's why God told Abraham the good news that all nations would be blessed because of him.