Luke 9:7
Now Herod the tetrarch heard of all that was done by him: and he was perplexed, because that it was said of some, that John was risen from the dead;
Cross-reference
Luke 9:9 continues the narrative: Herod admits beheading John and seeks to see Jesus—direct sequel.
Luke 9:19 repeats the same list of rumors (John, Elijah, prophet) that the disciples report to Jesus.
Luke 3:1 identifies Herod as tetrarch of Galilee, establishing the ruler's identity and political context.
Luke 13:32 has Jesus call Herod 'that fox'—a later, dismissive reference to the same ruler who is perplexed here.
Matthew 14:1-12 gives the fuller account of Herod's reaction and John's beheading — the same episode referenced in Luke 9:7.
Mark 6:14-28 provides the parallel account of Herod hearing about Jesus and the death of John the Baptist.
Mark 8:28 records the identical rumors about Jesus—John, Elijah, or a prophet—reported to Herod here.