Augustine of Hippo

Also, some can be sent to the living from the dead, just as in the opposite direction divine Scripture testifies that Paul was snatched from the living into paradise. Samuel the prophet, although dead, predicted future events to King Saul, who was alive, although some think that it was not Samuel himself who was able to be called forth by some magic, but that some spirit so allied with evil works had feigned a likeness to him—yet the book of Ecclesiasticus, which Jesus the son of Sirach is said to have written, but because of some …

On the Care of the Dead 15.18 ↗