According to the flesh— That is, with regard to his human nature. Both the natures of our Saviour are mentioned in this and the following verse. This too regards the Jew, and puts him in mind that Jesus, whom Paul preached, was of the royal stock, whence they expected the Messiah would spring. See Taylor and Locke
Related Commentaries of Romans 1:3
Romans 1:3
3 Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;