Matthew 26:56
But all this has taken place that the Scriptures of the prophets might be fulfilled. Then all the disciples left him and fled. The Scripture-fulfillment and the disciples' flight: the all this was to fulfill the Scriptures communicates Jesus' interpretive framework for the arrest. The all the disciples left him and fled is the fulfillment of the scattering prediction of Matthew 26:31 (you will all fall away).