John Chrysostom

By examples he teaches them prudence; and, by way of encouragement, mentions last the man who seduced the greatest number. And he mentions not one instance, but a second also: "for," saith the Scripture, "in the mouth of two witnesses": and yet he had it in his power to mention even three. …

Homily on Acts 14 ↗

Oecumenius

Then, bringing examples of those who have acted thoughtlessly in such matters and to their own ruin, he adduces Theudas and Judas the Galilean, who did not reach a favorable end for themselves. The examples are not old but recent, and many eyewitnesses to them exist. So that experience may guard against coming to a similar end, he cites these examples.

Commentary on Acts ↗

Bede

For before these days Theudas rose up, etc. This Theudas persuaded many, as Josephus reports, taking their possessions from the city, to occupy the banks of the Jordan. And since he was a magician, he claimed to be a prophet and that he could provide a passage through the divided stream by his command. But a troop of horsemen, by the order of the procurator Fadus, coming upon him, killed many, captured others, and brought his head back to Jerusalem.

Commentary on Acts ↗