Mark 15:6 Now at that feast he released unto them one prisoner, whomsoever they desired. | Matt 27:15 Now at that feast the governor was wont to release unto the people a prisoner, whom they would. | Luke 23:17 (For of necessity he must release one unto them at the feast.) | John 18:39a [1] But ye have a custom, that I should release unto you one at the passover: |
Only in Luke does Pilate bring Jesus to Herod. In the other gospels, Jesus stays with Pilate. For this reason, some of Luke's tex -- Luke 23:15 in particula -- is irreconcilable with the other gospels.
[1]Pilate is speaking.