John 9:22; John 12:42; John 16:2

John 9:22

22 His parents said this because they were afraid of the Jews; for the Jews had already agreed that if anyone confessed Him to be Christ, he was to be put out of the synagogue.

John 12:42

42 Nevertheless many even of the rulers believed in Him, but because of the Pharisees they were not confessing Him, for fear that they would be put out of the synagogue;

John 16:2

2 "They will make you outcasts from the synagogue, but an hour is coming for everyone who kills you to think that he is offering service to God.