An  account of  Jesus’ casting out a demon is found in Mark 5:1-20.  

When Jesus came to the country of the Gadarenes, a man met him. 

He had an “unclean spirit” (demon). 

This demon-possessed man lived in the tombs.  He wore no clothes. 

He was not in his right mind.  He cried day and night and cut himself with stones. 

He also had great strength. 

When others had bound him with chains, he broke them and escaped.

The evil spirit in the man knew who Jesus was and begged Him not to torment him. 

Jesus asked the evil spirit, “What is your name?”   He replied, “My name is Legion; for we are many.” 

When Jesus commanded the demons to come out of the man, they begged him to send them into pigs who were feeding nearby. 

Jesus did so. 

The pigs ran to the cliff, fell into the sea, and drowned. 

When the people of the area came to Jesus, they saw this man “sitting, clothed, and in his right mind.” 

When the demon was cast out, the man was restored to health of body and mind.

What's my point?

"Don't let anyone deceive you in any way, for that day will not come until the rebellion occurs and the man of lawlessness is revealed, the man doomed to destruction.

He will oppose and will exalt himself over everything that is called God or is worshiped, so that he sets himself up in God's temple, proclaiming himself to be God."

God's temple:

“We Are the Temple of God,” that in which He dwells on this earth.