So the Jews, [who were assembled in the synagogue. See verse 59] began complaining about Jesus because He had said, "I am the bread that came down from heaven."

Then the Jews [who were assembled in the synagogue. See verse 59] began arguing bitterly with one another, saying, "How can this man give us his physical body to eat?"

Jesus said these things in the synagogue as He taught in Capernaum.

His parents said these things because they were afraid of the Jewish authorities who had already decided that anyone who confessed Jesus to be the Christ would be expelled from the synagogue.

They replied to the beggar, "You were born entirely in sins [i.e., you have been a sinner all your life], and you are [trying] to teach us?" Then they threw him out [of the synagogue. See verse 22].

However, even many [Jewish] leaders believed in Him, but did not admit it, for fear of being expelled from the synagogue.