Commentaries:
Jamieson, Fausset, and Brown
Howbeit we know this man, etc.—This seems to refer to some current opinion that Messiah's origin would be mysterious (not altogether wrong), from which they concluded that Jesus could not be He, since they knew all about His family at Nazareth.
some of them of Jerusalem—the citizens, who, knowing the long-formed purpose of the rulers to put Jesus to death, wondered that they were now letting Him teach openly.
Other Jamieson, Fausset, and Brown entries containing John 7:27:
1 Timothy 3:16
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