NET
12 That very day Herod and Pilate became friends with each other, for prior to this they had been enemies.
Darby
12 And Pilate and Herod became friends with one another the same day, for they had been at enmity before between themselves.
KJV
12 And the same day Pilate and Herod were made friends together: for before they were at enmity between themselves.