Commentaries:
Robertson's Word Pictures (NT)
Except ye eat (ean mh faghte). Negative condition of third class with second aorist active subjunctive of esqiw. Jesus repeats the statement in verses John 6:50-51. Note change of mou (my) in verse John 6:51 to tou uiou tou anqrwpou with same idea.
And drink his blood (kai pihte autou to aima). Same condition with second aorist active subjunctive of pinw. This addition makes the demand of Jesus seem to these Jews more impossible than before if taken in a baldly literal sense. The only possible meaning is the spiritual appropriation of Jesus Christ by faith (verse John 6:47), for "ye have not life in yourselves" (ouk exete zwhn en eautoiv). Life is found only in Christ.
Other Robertson's Word Pictures (NT) entries containing John 6:53:
John 6:39
John 6:54
John 6:57
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