He said this while teaching in the synagogue at Capernaum.

His parents said this because they were afraid of the Jewish leaders, since the Jewish leaders had already agreed that anyone who acknowledged that Jesus was the Messiah would be thrown out of the synagogue.

Yet many people, even some of the authorities, believed in him, but because of the Pharisees they did not admit it so they would not be thrown out of the synagogue.

You'll be thrown out of the synagogues. Yes, a time is coming when the one who kills you will think he's serving God.

Jesus answered him, "I have spoken publicly to the world. I have always taught in the synagogue or in the Temple, where all Jews meet together, and I have said nothing in secret.