17th century Baptist catechism:
Q. 99. Wherein do Baptism and the Lord's Supper differ from the other ordinances of God?
A. Baptism and the Lord's Supper differ from the other ordinances of God in that they were specially instituted by Christ to represent and apply to believers the benefits of the new covenant by visible and outward signs.
(a) Matt 28:19; Acts 22:16; Matt 26:26-28; Rom 6:4
Q. 107. What is the Lord's Supper?
A. The Lord's Supper is a holy ordinance, wherein, by giving and receiving bread and wine, according to Christ's appointment, His death is showed forth, and the worthy receivers are, not after a corporeal 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.
(a) 1 Cor 11:23-26; 1 Cor 10:16
Q. 108. What is required to the worthy receiving of the Lord's Supper?
A. It is required of them that would worthily (that is, suitably) partake of the Lord's Supper, that they examine themselves, of their knowledge to discern the Lord's body; of their faith to feed upon Him; of their repentance, love, and new obedience: lest, coming unworthily, they eat and drink judgment to themselves.
(a) 1 Cor 11:27-31; 1 Cor 5:8; 2 Cor 13:5