Communion or the Lord's Supper is an act of obedience whereby believers remember the death of our Savior and look forward to His coming again. Celebrating the Lord's Supper brings the body of believers together. It is a reminder of the fact that Jesus' body was broken for us and that His blood was shed for us. Communion should only be taken by those who are saved, baptized, and committed to a local church. It should not be partaken by those who have not yet trusted Jesus as their Savior. As the body of believers come together for the Lord's Supper it should serve as a time for believers to repent of sins, reflect on the goodness and grace of God, and rejoice in the assurance that God has redeemed us.
"For I say unto you, I will not drink of the fruit of the vine, until the kingdom of God shall come. And He took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me. Likewise, also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you." - Luke 22:18-20
"The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? For we being many are one bread, and one body: for we are all partakers of that one bread. Behold Israel after the flesh: are not they which eat of the sacrifices partakers of the altar? What say I then? that the idol is any thing, or that which is offered in sacrifice to idols is anything?" - 1st Corinthians 10:16-19