As they spoke to the people, the priests and the captain of the temple and the Sadducees came to them, 2 being upset because they taught the people and proclaimed in Jesus the resurrection from the dead. 3 They laid hands on them, and put them in custody until the next day, for it was now evening. 4 But many of those who heard the word believed, and the number of the men came to be about five thousand. Acts 4: 1-4
Those who were astonished by the courage of Peter and John when they preached the gospel were not ordinary men, but rulers, elders and teachers of the Law.