New Defender's Study Bible Notes
11:2 in the prison. John had been imprisoned by Herod soon after he had baptized Jesus and had directed his own disciples to follow Christ (note also Matthew 4:12; John 1:35-36). John had rebuked Herod’s adultery (Matthew 14:3-4), and had been imprisoned because of this. Apparently his remaining disciples still had access to him, for Herod still respected John and his influence.