John Chrysostom

Further, lest any should say that abandoning their acquaintances they went to show themselves, (or as it were to vaunt themselves with a kind of pomp,) to strangers, therefore first among the very murderers themselves are the signs of the resurrection displayed, in that very city wherein the frantic outrage burst forth. For where the crucifiers themselves are seen to believe, there the resurrection is most of all demonstrated.

Catena Aurea by Aquinas ↗

Theophylact of Ohrid

But herein that He says, Repentance and remission of sins, He also makes mention of baptism, in which by the putting off of our past sins there follows pardon of iniquity. But how must we understand baptism to be performed in the name of Christ alone, whereas in another place He commands it to be in the name of the Father, and the Son, and the Holy Ghost. …

Catena Aurea by Aquinas ↗

Augustine of Hippo

What did he tell them from the Scriptures? He said, "Repentance and forgiveness of sins should be preached in his name to all nations, beginning from Jerusalem." The disciples could not see this. They could see Christ talking about the church that would be. When Christ said something they could not see, they believed him. They could see the head, but they could not yet see the body. We can see the body, but we believe about the head. They are two: husband and wife, head and body, Christ and the church. …

Sermon 229I.1 ↗

Bede

And that repentance and remission of sins should be preached in His name among all nations, beginning at Jerusalem. The rage of the heretics is not hidden in a corner; the Church is spread throughout the whole world; all nations have the Church, let no one deceive us, it is the true one, it is catholic, it began at Jerusalem, it reached us, and it is there and here. For it did not leave there to come here. It grew, it did not migrate. …

On the Gospel of Luke ↗