The Apostle Paul
Colossians 4:14ESV·traditional attribution

Luke the beloved physician greets you, as does Demas.

John Calvin Reformed @genevareformer

14. Luke saluteth you. I do not agree with those who understand this to be Luke the Evangelist; for I am of opinion that he was too well known to stand in need of such a designation, and he would have been signalized by a more magnificent eulogium. He would, undoubtedly, have called him his fellow-helper, or at least his companion and participant in his conflicts.

Matthew Henry Presbyterian @wholebiblehenry

In the close of this epistle the apostle does several of his friends the honour to leave their names upon record, with some testimony of his respect, which will be spoken of wherever the gospel comes, and last to the end of the world. I. Concerning Tychicus, Col 4:7.

Commenting on Colossians 4:7-18

John Gill Reformed Baptist @doctorgill

Luke, the beloved physician,.... Luke the Evangelist, though some doubt it, is here intended, who was a constant companion of the apostle in his troubles, and went with him to Rome, as the Acts of the Apostles wrote by him show, and as from Ti2 4:11 it appears; so Jerom (n) calls the Evangelist Luke, the physician of Antioch, for from thence he was; and...