Men and brethren, this scripture must needs have been fulfilled, which the Holy Spirit by the mouth of David spoke before concerning Judas, who was guide to them that took Jesus.
All Commentaries on Acts 1:16 Go To Acts 1
John Chrysostom
AD 407
the scripture had to be fulfilled: Always he comforts them by the prophecies. So does Christ on all occasions. In the very same way, he shows here that no strange thing had happened, but what had already been foretold.
which the Holy Spirit spoke beforehand by the mouth of David: He does not say, David, but the Spirit through him. See what kind of doctrine the writer has at the very outset of the book. Do you see, that it was not for nothing that I said in the beginning of this work, that this book is the Polity of the Holy Spirit?