Now when they saw the boldness of Peter and John, and perceived that they were unlearned and ignorant men, they marvelled; and they took knowledge of them, that they had been with Jesus.  (Act 4:13 KJV) 

And they called them, and commanded them not to speak at all nor teach in the name of Jesus. But Peter and John answered and said unto them, Whether it be right in the sight of God to hearken unto you more than unto God, judge ye. For we cannot but speak the things which we have seen and heard. (Act 4:18-20 KJV)