Albert Barnes Commentary John 6:66

"Upon this many of his disciples went back, and walked no more with him." — John 6:66 (ASV)

Many of His disciples. Many who had followed Him professedly as His disciples and were desirous of learning from Him. (See Barnes on John 6:60).

Went back. They turned away from Him and left Him. From this we may learn:

1. Not to wonder at the apostasy of many who profess to be followers of Christ. Many are induced to become His professed followers by the prospect of some temporal benefit, or under some public excitement, as these were; and when that temporal benefit is not obtained, or that excitement is over, they fall away.
2. Many may be expected to be offended by the doctrines of the gospel. Having no spirituality of mind, and really understanding nothing of the gospel, they may be expected to take offense and turn back. The best way to understand the doctrines of the Bible is to be a sincere Christian and aim to do the will of God (John 7:17).
3. We should examine ourselves. We should honestly inquire whether we have been led to make a profession of religion by the hope of any temporal advantage, by any selfish principle, or by mere excited animal feeling. If we have, it will profit us nothing, and we shall either fall away of ourselves or be cast away in the great day of judgment.