8 For I tell you that Christ has become a servant of the Jewsa on behalf of God’s truth, so that the promises made to the patriarchs might be confirmed

Read Romans 15:8 Using Other Translations

Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers:
For I tell you that Christ became a servant to the circumcised to show God's truthfulness, in order to confirm the promises given to the patriarchs,
Remember that Christ came as a servant to the Jews to show that God is true to the promises he made to their ancestors.