The night before He was crucified, the night that He was betrayed, the Lord Jesus had a meal with his apostles:
Now as they were eating, Jesus took bread, and after blessing it broke it and gave it to the disciples, and said, “Take, eat; this is my body.” And he took a cup, and when he had given thanks he gave it to them, saying, “Drink of it, all of you, for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. I tell you I will not drink again of this fruit of the vine until that day when I drink it new with you in my Father's kingdom.” Matthew 26:26-30 (ESV)
Jesus told us to "Do this in remembrance of me” (Luke 22:19). Christians continue to celebrate Communion and remember Jesus' death for our sins.
The Apostle Paul in 1 Corinthians 10:16-17 says, "The cup of blessing that we bless, is it not a participation in the blood of Christ? The bread that we break, is it not a participation in the body of Christ? Because there is one bread, we who are many are one body, for we all partake of the one bread."
As we enjoy the Lord's Supper in remembrance of Jesus, we are participating in his body and blood given for our sins, and we are joined together with other Christians. Paul goes on to say in 1 Corinthians 11:26, "For as often as you eat this bread and drink the cup, you proclaim the Lord's death until he comes." As we remember, participate, and proclaim, we are also warned to be careful:
"Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty concerning the body and blood of the Lord. Let a person examine himself, then, and so eat of the bread and drink of the cup. For anyone who eats and drinks without discerning the body eats and drinks judgment on himself." 1 Corinthians 11:27-29 (ESV)
We teach that the Body and Blood of Christ are truly present, and are distributed to those who eat the Supper of the Lord and that this is a gift that God gives to us, rather than just a "work" we do for God. All who believe that Jesus Christ is their Lord and Savior, who believe that He is present with His Body and Blood to confirm the forgiveness of sins, who remember His sacrificial death at the cross, and who come in repentance and gratitude are invited to receive the Sacrament of the Lord’s Supper.
During the time of Communion, children who have not yet been instructed regarding Holy Communion (Confirmation) are also invited to come forward to receive a blessing.