Charles Spurgeon Commentary Romans 15:8

"For I say that Christ hath been made a minister of the circumcision for the truth of God, that he might confirm the promises [given] unto the fathers," — Romans 15:8 (ASV)

It was to Abraham and his descendants that the promise was made that, in him, and in his seed, all the nations of the earth should be blessed. So our Lord came, as a Jew, to be a minister of the circumcision. Let us never forget that he came to those whom we are apt to forget; and, perhaps, even to despise, to confirm the promises made unto the fathers.