Commentaries:
Robertson's Word Pictures (NT)
For (gar). Explanatory use of gar.
The Scripture (thn grafhn). 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 ff.).
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.
Other Robertson's Word Pictures (NT) entries containing John 20:9:
Mark 16:5
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