For (gar). Explanatory use of gar. The Scripture (thn graphn). Probably Psalms 16:10 . Jesus had repeatedly foretold his resurrection, but that was all forgotten in the great sorrow on their hearts. Only the chief priests and Pharisees recalled the words of Jesus ( Matthew 27:62 ). Must (dei). For this use of dei concerning Christ's death and resurrection see Mark 8:31 ; Matthew 26:54 ; Luke 9:22 ; Luke 17:25 ; Luke 22:37 ; Luke 24:7 Luke 24:26 Luke 24:44 John 3:14 ; John 12:34 ; Acts 1:16 . Jesus had put emphasis on both the fact and the necessity of his resurrection which the disciples slowly perceived.