What is the Lord's supper?

Answer

The Lord's supper is an ordinance of the New Testament, instituted by Jesus Christ; wherein by giving and receiving bread and wine, according to his appointment, his death is shown forth, and the worthy receivers are, not after a corporal and carnal manner, but by faith, made partakers of his body and blood, with all his benefits, to their spiritual nourishment and growth in grace (; ; ).

Read the 3 proof texts (KJV)

Matthew 26:26-28: ²⁶And as they were eating, Jesus took bread, and blessed [it], and brake [it], and gave [it] to the disciples, and said, Take, eat; this is my body. ²⁷And he took the cup, and gave thanks, and gave [it] to them, saying, Drink ye all of it; ²⁸For this is my blood of the new testament, which is shed for many for the remission of sins.
1 Corinthians 11:23-26: ²³For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread: ²⁴And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. ²⁵After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me. ²⁶For as often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come.
1 Corinthians 10:16: 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?