John 18:19-21

Meanwhile, the high priest questioned Jesus about his disciples and his teaching. "I have spoken openly to the world," Jesus replied. "I always taught in synagogues or at the temple, where all the Jews come together. I said nothing in secret. Why question me? Ask those who heard me. Surely they know what I said."

I always taught in synagogues 
Matthew 4:23  Jesus went throughout Galilee, teaching in their synagogues, proclaiming the good news of the kingdom, and healing every disease and sickness among the people.
Matthew 9:35  Jesus went through all the towns and villages, teaching in their synagogues, proclaiming the good news of the kingdom and healing every disease and sickness. 
Matthew 13:54  Coming to his hometown, he began teaching the people in their synagogue, and they were amazed. "Where did this man get this wisdom and these miraculous powers?" they asked. 
Mark 1:21  They went to Capernaum, and when the Sabbath came, Jesus went into the synagogue and began to teach.
Luke 4:14-15  Jesus returned to Galilee in the power of the Spirit, and news about him spread through the whole countryside. He was teaching the their synagogues, and everyone praised him.
John 6:59  He said this while teaching in the synagogue in Capernaum. 

or at the temple 
Matthew 26:55  In that hour Jesus said to the crowd, "Am I leading a rebellion, that you have come out with swords and clubs to capture me? Every day I sat in the temple courts teaching, and you did not arrest me." 
Mark 12:35  While Jesus was teaching in the temple courts, he asked, "Why do the teachers of the law say that the Messiah is the son of David?"
John 7:14  Not until halfway through the festival did Jesus go up to the temple courts and begin to teach.

I said nothing in secret 
John 7:25-26  At that point some of the people of Jerusalem began to ask, "Isn't this the man they are trying to kill? Here he is, speaking publicly, and they are not saying a word to him. Have the authorities really concluded that he is the Messiah?" 
 
Scriptures taken from the Holy Bible, New International Version® NIV®, 
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