I asked for Galatians 3:28 , not 3:8.
but actually i like your 3:8. The OT Jews thought Genesis was teaching all nations will be blessed by physical decendents of Abraham
Paul in Galatians makes clear that Genesis is talking about those that believe in Jesus Christ are the heirs to the promises to Abraham and all the nations of the world shall be blessed by the Church, as it brings the Gospel.
NEW DOCTRINE.
The physical descendent of Abraham that blessed all men was Christ..Remember that the entire OT is a prophetic revelation to the jews ... as scripture tells us the jews were/are blinded to the spirituality
Jesus said the entire OT..law and prophets was about Him