TSK · Acts 11:13

At about the ninth hour of the day, he clearly saw in a vision an angel of God coming to him, and saying to him, "Cornelius!"

Cornelius said, "Four days ago, I was fasting until this hour, and at the ninth hour, I prayed in my house, and behold, a man stood before me in bright clothing,

Aren't they all serving spirits, sent out to do service for the sake of those who will inherit salvation?