They came, saying, that they had also seen a vision of angels. –Luke 24:23 (KJV)

A devout man, and one that feared God with all his house, which gave much alms to the people, and prayed to God alway. He saw in a vision evidently about the ninth hour of the day an angel of God coming in to him, and saying unto him, Cornelius. –Acts 10:2-3 (KJV)

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Jack Deere, Why I Am Still Surprised by the Voice of God, pp. 66-67.

Wayne Grudem, The Gift of Prophecy, p. 13.

Richard Baxter, The Certainty of the Worlds of Spirits, p. 233ff.