He spoke these things in the synagogue. John points out the place, that we may know that there were many present, and likewise, that a sermon was delivered as on a weighty and important subject. But it immediately follows that out of so great a multitude there were scarcely to be found a very few who profited by it; and -- what is worse -- it proved to be the occasion of desertion to many who professed to be disciples of Christ. If the Evangelist had said that only some of them were offended, that ought to have been accounted monstrous; but when they rise up in crowds and conspire together against him, what name shall we give to such an action? Let this narrative then be deeply impressed on our minds, that we may never murmur against Christ when he speaks; and if in the present day we perceive any thing of this kind in others, let not their pride disturb our faith.

In the synagogue - in Capernaum - From John 6:26, to this verse, the evangelist gives us the discourse which our Lord preached in the synagogue, in which he was repeatedly interrupted by the Jews; but this gave him the fuller opportunity to proclaim the whole truth relative to his passion and death, to edify the disciples, and confute these gainsayers.

These things said he in the synagogue,.... Openly and publicly, in the place of divine worship, where the Jews resorted for that purpose:
as he taught in Capernaum; his own city, and where there was a synagogue, into which he often went and taught his doctrines, and wrought miracles; see Matthew 3:13.

These things said he in the synagogue--which seems to imply that what follows took place after the congregation had broken up.

These things said he in the synagogue. In the ruins, called Tel Hum, supposed to be those of Capernaum, are found those of a synagogue known to have been erected in the Herodian period by its style of architecture. There is ground for believing that this is the one erected by the centurion that "loveth our nation" (Luke 7:5), and in which Christ spoke.