They said, “Teacher, Moses wrote that if a man’s brother dies, leaving a wife but no children, then that man must marry the widow and have children for his brother.
Herod himself had ordered his soldiers to arrest John and put him in prison in order to please his wife, Herodias. She had been the wife of Philip, Herod’s brother, but then Herod had married her.
But John spoke against Herod, the governor, because of his sin with Herodias, the wife of Herod’s brother, and because of the many other evil things Herod did.
If two brothers are living together, and one of them dies without having a son, his widow must not marry someone outside her husband’s family. Her husband’s brother must marry her, which is his duty to her as a brother-in-law.