Communion: Fellowship with the Lord, Awareness of the presence of the Lord.

The cup of blessing which we take, does it not give us a part in the blood of Christ? and is not the broken bread a taking part in the body of Christ?
1 Corinthians 10:16

It is not possible for you, at the same time, to take the cup of the Lord and the cup of evil spirits; you may not take part in the table of the Lord and the table of evil spirits.
1 Corinthians 10:21

Keep the word of the Lord, go to him for directions, and live!

So death came to Saul because of the sin which he did against the Lord, that is, because of the word of the Lord which he kept not; and because he went for directions to one who had an evil spirit,
1 Chronicles 10:13

And not to the Lord: for this reason, he put him to death and gave the kingdom to David, the son of Jesse.
1 Chronicles 10:14