His disciples at large, so called because they followed him, partly to hear what he would say, partly to see his miracles, followed him no more. Many professors and seeming disciples of Christ may draw back and fall from their profession, though none that truly receive Christ shall fall away, but be by the power of God preserved through faith unto salvation.
Related Commentaries of John 6:66
John 6:66
66 From that time many of his disciples went back, and walked no more with him.