Luke 23:7

And as soon as he knew that he belonged unto Herod’s jurisdiction, he sent him to Herod, who himself also was at Jerusalem at that time.

Cross-reference

Luke 3:1 identifies Herod as tetrarch of Galilee, directly confirming the jurisdiction Pilate discovers in Luke 23:7.

Luke 13:31 records Herod's earlier desire to kill Jesus, showing his ongoing hostility that culminates in the trial before him.

Acts 4:27 gathers Herod and Pilate as co-conspirators, confirming the political alliance that sent Jesus to Herod.

Mark 6:14 notes Herod's awareness of Jesus' reputation, setting the stage for their encounter during the trial.