'Spirits' in the Bible

When it was evening, many demon-possessed people were brought to him. He drove out the spirits with a word, and healed all who were sick.

Jesus called his twelve disciples and gave them authority over unclean spirits so they could cast them out and heal every kind of disease and sickness.

Then it goes and brings with it seven other spirits more evil than itself, and they go in and live there, so the last state of that person is worse than the first. It will be that way for this evil generation as well!"