To lead about a sister, a wife — i.e., to take with us on our journeys a Christian woman as a wife. Roman divines have interpreted this as referring to “the custom of Christian matrons attending as sisters upon the Apostles.” But as the Apostle illustrates his meaning by a reference to Peter, who we know had a wife, such an interpretation is inadmissible. St. Paul, in this verse, carries his statement of apostolic right to support one step further. Not only had he a right to be supported himself, but the support of the married Apostles and their wives by the Church implied the same right on the part of all. A practice which grew out of a misapprehension of the real meaning of this passage, led to grave scandal, and was finally condemned by the first Council of Nicæa (A.D. 325).
The brethren of the Lord, and Cephas. — These are mentioned specially, not as distinct from the Apostles (for Cephas, of course, was one), but as examples which would have great weight with the particular Jewish faction to whom this argument was adduced. James was Bishop of Jerusalem (Acts 15:13; Acts 21:18). The other brethren of our Lord were Joses, Simon, and Judas (Matthew 13:55). They were not of the twelve Apostles, even after their conversion being mentioned as distinct from the Twelve (Acts 1:14), although James subsequently occupied an apostolic position (Galatians 2:9). Various and ingenious suggestions have been made as to who these “brethren of the Lord” were; amongst others, that they were cousins, or that they were children of Joseph by a former marriage. These views grew out of a desire to establish the perpetual virginity of Mary. The natural conclusion from a study of the mention of their names in the Gospels, without preconceived prejudice, would be that Joseph and Mary lived together after the miraculous birth of Christ, and that these were their children. This, too, is supported by the use of the word “first-born” in reference to our Lord (Matthew 1:25; Luke 2:7), and the word “till” (Matthew 1:25), and “before they came together” (Matthew 1:18), and the repeated mention of them as brethren in connection with His mother Mary. (See Note on Matthew 12:46.)