19 Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 and teaching them to obey everything that I have commanded you. And remember, I am with you always, to the end of the age.
19 Then he took a loaf of bread, and when he had given thanks, he broke it and gave it to them, saying, ‘This is my body, which is given for you. Do this in remembrance of me.’ 20 And he did the same with the cup after supper, saying, ’This cup that is poured out for you is the new covenant in my blood.
1 Cor. 11:23–25
23 For I received from the Lord what I also handed on to you, that the Lord Jesus on the night when he was betrayed took a loaf of bread, 24 and when he had given thanks, he broke it and said, ‘This is my body that is for you. Do this in remembrance of me.’ 25 In the same way he took the cup also, after supper, saying, ‘This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.’
Book of Confessions, 3:21
As the fathers under the Law, besides the reality of the sacrifices, had two chief sacraments, that is, circumcision and the passover, and those who rejected these were not reckoned among God’s people; so do we acknowledge and confess that now in the time of the gospel we have two chief sacraments, which alone were instituted by the Lord Jesus and commanded to be used by all who will be counted members of his body, that is, Baptism and the Supper or Table of the Lord Jesus, also called the Communion of His Body and Blood. These sacraments, both of the Old Testament and of the New, were instituted by God not only to make a visible distinction between his people and those who were without the Covenant, but also to exercise the faith of his children and, by participation of these sacraments, to seal in their hearts the assurance of his promise, and of that most blessed conjunction, union, and society, which the chosen have with their Head, Christ Jesus. And so we utterly condemn the vanity of those who affirm the sacraments to be nothing else than naked and bare signs. No, we assuredly believe that by Baptism we are engrafted into Christ Jesus, to be made partakers of his righteousness, by which our sins are covered and remitted, and also that in the Supper rightly used, Christ Jesus is so joined with us that he becomes the very nourishment and food of our souls. Not that we imagine any transubstantiation of bread into Christ’s body, and of wine into his natural blood, as the Romanists have perniciously taught and wrongly believed; but this union and conjunction which we have with the body and blood of Christ Jesus in the right use of the sacraments is wrought by means of the Holy Ghost, who by true faith carries us above all things that are visible, carnal, and earthly, and makes us feed upon the body and blood of Christ Jesus, once broken and shed for us but now in heaven, and appearing for us in the presence of his Father. Notwithstanding the distance between his glorified body in heaven and mortal men on earth, yet we must assuredly believe that the bread which we break is the communion of Christ’s body and the cup which we bless the communion of his blood. Thus we confess and believe without doubt that the faithful, in the right use of the Lord’s Table, do so eat the body and drink the blood of the Lord Jesus that he remains in them and they in him; they are so made flesh of his flesh and bone of his bone that as the eternal Godhood has given to the flesh of Christ Jesus, which by nature was corruptible and mortal, life and immortality, so the eating and drinking of the flesh and blood of Christ Jesus does the like for us. We grant that this is neither given to us merely at the time nor by the power and virtue of the sacrament alone, but we affirm that the faithful, in the right use of the Lord’s Table, have such union with Christ Jesus as the natural man cannot apprehend. Further we affirm that although the faithful, hindered by negligence and human weakness, do not profit as much as they ought in the actual moment of the Supper, yet afterwards it shall bring forth fruit, being living seed sown in good ground; for the Holy Spirit, who can never be separated from the right institution of the Lord Jesus, will not deprive the faithful of the fruit of that mystical action. Yet all this, we say again, comes of that true faith which apprehends Christ Jesus, who alone makes the sacrament effective in us. Therefore, if anyone slanders us by saying that we affirm or believe the sacraments to be symbols and nothing more, they are libelous and speak against the plain facts. On the other hand we readily admit that we make a distinction between Christ Jesus in his eternal substance and the elements of the sacramental signs. So we neither worship the elements, in place of that which they signify, nor yet do we despise them or undervalue them, but we use them with great reverence, examining ourselves diligently before we participate, since we are assured by the mouth of the apostle that “whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord.”