1 Corinthians 9:5

To lead about a sister, a wife] RV 'a wife that is a believer'; i.e. to claim support on his journeys for his wife as well as himself. It is implied that the Apostles were mostly married; Peter's wife's mother is mentioned Matthew 8:14. No doubt their wives were of great service in getting access to the women of Eastern cities. Lead] as the companion of his travels. He asserts that he could reasonably claim not only support for a wife, but also payment of her travelling expenses as well as his own. The brethren of the Lord] cp. Matthew 12:46; Matthew 13:55. They seem here included among the Apostles; but the title of Apostle was not limited to the Twelve.