One saith, I am of Paul; and another, I am of Apollos; are ye not carnal? 3:4
Trivia: According to 1 Corinthians 11:3, who is the head of every man?
Paul says that the other apostles traveled with their wives - including Peter. We know from Mark 1:30 that Peter had a wife, since Jesus cured his mother-in-law. Paul confirms Peter's marital status here.