In case you ever need to know:
How to tell an angel
from the devil in disguise
There are two kinds of beings in heaven, namely: Angels, who are resurrected personages, having bodies of flesh and bones ... Secondly: the spirits of just men made perfect, they who are not resurrected, but inherit the same glory.
When a messenger comes saying he has a message from God, offer him your hand and request him to shake hands with you. If he be an angel he will do so, and you will feel his hand. If he be the spirit of a just man made perfect … he will not move ... but he will still deliver his message.
If it be the devil as an angel of light, when you ask him to shake hands he will offer you his hand, and you will not feel anything; you may therefore detect him.