6 When Pilate heard [a]of Galilee, he asked if the Man were a Galilean. 7 And as soon as he knew that He belonged to Herod’s jurisdiction, he sent Him to Herod, who was also in Jerusalem at that time. 8 Now when Herod saw Jesus, he was exceedingly glad; for he had desired for a long time to see Him, because he had heard many things about Him, and he hoped to see some miracle done by Him. 9 Then he questioned Him with many words, but He answered him nothing. 10 And the chief priests and scribes stood and vehemently accused Him. 11 Then Herod, with his [b]men of war, treated Him with contempt and mocked Him, arrayed Him in a gorgeous robe, and sent Him back to Pilate. 12 That very day Pilate and Herod became friends with each other, for previously they had been at enmity with each other.
Luke 23:6-12
Jesus faces Herod. Realizing that Jesus was under the jurisdiction of Galilee, Pilate passed the buck to Herod, the same man who had John the Baptist executed. Herod was eager to meet Jesus, thinking He might entertain with a miracle like some sort of sideshow act.
As Herod questioned, then began to mock Christ, Jesus remained silent. He was turning the other cheek and taking on the sin of Herod as well as His accusers. Through this trial, Herod saw no guilt in Jesus worthy of death. He dressed Christ in a “gorgeous” robe (perhaps an attempted appeal to vanity?) and sent Him back to Pilate.
Curiously the author points out here that Pilate and Herod, once at enmity, were now friends due to the shared interaction with Jesus.