New Defender's Study Bible Notes
26:30 sung an hymn. It is striking that the only recorded instance of Jesus singing is just as He prepared to go to the cross. However, after He comes again, He will sing joyfully in the midst of His redeemed people (Zephaniah 3:17).
26:31 it is written. This is in fulfillment of Zechariah 13:7. Despite all Jesus had done in trying to prepare His disciples for these events, His arrest seemed to take them by surprise and to discourage them so much that they all “forsook Him and fled” when it happened (Matthew 26:56).