Acts 12:15

‘And they said to her, “You are mad.” But she confidently affirmed that it was even so. And they said, “It is his angel.” '

Then, while Peter continued knocking, they first told her that she was mad, and then, when she continued to affirm that it was true, began a discussion as to what it could be that was at the door. ‘It is his angel', they said. Perhaps they were saying ‘He is dead and his angel has come to visit us to tell us.' They had been praying for his safety all night and now they could not believe it. Or perhaps they thought that he was still alive although awaiting the worst and that his angel had come to reassure them. Jesus had spoken of ‘little ones' having their own angels watching over them (Matthew 18:10; Hebrews 1:14). This may have been what was in their minds. But one thing is clear. They did not believe that God could have answered their prayers.