The people gathered in the house consider Peter’s real presence at the gate to be impossible.1 As a result they seek to explain his voice with reference to a common assumption of their day. The Jews believed that every person has a guardian angel (see Psalm 91:11; Matthew 18:10; Hebrews 1:14).2 These angels were thought to bear the image of the person whom they were protecting, making a visible appearance after their death.3
15 They said to her, “You are out of your mind.” But she kept insisting that it was so, and they kept saying, “It is his angel!”