Adam Clarke on Acts 9:10

A certain disciple - named Ananias - A general opinion has prevailed in the Greek Church that this Ananias was one of the seventy-two disciples, and that he was martyred; and they celebrate his martyrdom on the first of October. It has been farther stated that his house was turned into a church, which remains to the present day, though now occupied as a Turkish mosque; but even the Mohammedans have the tradition, and treat his memory with great respect. However this may be, from Act 22:12, we learn, what is of more importance, that he was a devout man according to the law, having a good report of all the Jews that dwelt there. See on Act 9:17 (note).

To him said the Lord in a vision - Εν ὁραματι, In a strong impression made upon his mind, which left no doubt concerning its heavenly origin, nor of the truth of the things represented by it. It is very probable that the whole took place in a dream.