He reminds the judges of two popular uprisings and agitators: a certain Theudas, a person not definitely known from history, and Judas the Galilean.
Judas caused an uprising during and because of the census of the people. The Roman emperor Augustus commanded Quirinius, the Syrian governor, to conduct it in Judea, and because of it the nativity of our Lord Jesus Christ took place in Bethlehem (Lk 2:2).
Since the work of the apostles appeared dangerous in the eyes of the Sanhedrin, because it was growing more and more (v. 28), Gamaliel recalls that the mentioned popular agitators had likewise at first succeeded and drawn hundreds of people after them.
But, he says, since their work was not the work of God, they themselves perished, and their followers were scattered and disappeared.
“And now I say to you, keep away from these men and leave them alone. For if this plan or this work is from men, it will be overthrown.
But if it is from God, you cannot overthrow it. Take care lest you be found even to be fighting against God.”
The comparison of the apostles with popular agitators seems to show that Gamaliel personally did not have a high opinion of the preachers of Christ.
Yet in the counsel with which Gamaliel then addressed the Sanhedrin, a favorable opinion of Christianity is reflected. He allows the possibility that the work of the apostles is the work of God, and warns men not to be found fighters against God.