Commentaries:
Robertson's Word Pictures (NT)
The multitude (o oxlov). Outside of Jerusalem (the Galilean crowd as in verses John 7:11 f.) and so unfamiliar with the effort to kill Jesus recorded in John 5:18. It is important in this chapter to distinguish clearly the several groups like the Jewish leaders (John 7:13, John 7:15, John 7:25-26, John 7:30, John 7:32, etc.), the multitude from Galilee and elsewhere (John 7:10-13, John 7:20, John 7:31, John 7:40, John 7:49), the common people of Jerusalem (John 7:25), the Roman soldiers (John 7:45 f.).
Thou hast a devil (daimonion exeiv). "Demon," of course, as always in the Gospels. These pilgrims make the same charge against Jesus made long ago by the Pharisees in Jerusalem in explanation of the difference between John and Jesus (Matthew 11:18; Luke 7:33). It is an easy way to make a fling like that. "He is a monomaniac labouring under a hallucination that people wish to kill him" (Dods).
Other Robertson's Word Pictures (NT) entries containing John 7:20:
John 7:1
John 7:20
John 8:37
John 10:20
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