Wherein do the sacraments of baptism and the Lord's supper agree?
The sacraments of baptism and the Lord's supper agree, in that the author of both is God;1 the spiritual part of both is Christ and his benefits;2 both are seals of the same covenant,3 are to be dispensed by ministers of the gospel, and by none other;4 and to be continued in the church of Christ until his second coming.5
Scripture proofs
The Westminster Assembly's proof texts (KJV). The bracketed numbers in the answer above mark the clause each set of references supports; expand a row to read the verses.
1 Matt. 28:19; 1 Cor. 11:23
Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
For 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:
2 Rom. 6:3–4; 1 Cor. 10:16
Rom. 6:3 Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
Rom. 6:4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
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?
3 Rom. 4:11; Col. 2:12; Matt. 26:27–28
And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:
Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
Matt. 26:27 And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it;
Matt. 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
4 John 1:33; Matt. 28:19; 1 Cor. 4:1; 1 Cor. 11:23; Heb. 5:4
And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost.
Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
Let a man so account of us, as of the ministers of Christ, and stewards of the mysteries of God.
For 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:
And no man taketh this honour unto himself, but he that is called of God, as was Aaron.
5 Matt. 28:19–20; 1 Cor. 11:26
Matt. 28:19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
Matt. 28:20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
For as often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come.
This doctrine across the Standards
Where the Confession and the Westminster Shorter Catechism treat the same matter, so the question can be studied alongside its parallel statements.
In the Westminster Confession
XXIX.1 Our Lord Jesus, in the night wherein he was betrayed, instituted the sacrament of his body and blood, …
Our Lord Jesus, in the night wherein he was betrayed, instituted the sacrament of his body and blood, called the Lord's Supper, to be observed in his Church, unto the end of the world; for the perpetual remembrance of the sacrifice of himself in his death, the sealing all benefits thereof unto true believers, their spiritual nourishment and growth in him, their further engagement in and to all duties which they owe unto him; and to be a bond and pledge of their communion with him, and with each other, as members of his mystical body.
→ XXIX.1 · Of the Lord's SupperXXIX.2 In this sacrament Christ is not offered up to his Father, nor any real sacrifice made at all …
In this sacrament Christ is not offered up to his Father, nor any real sacrifice made at all for remission of sins of the quick or dead, but only a commemoration of that one offering up of himself, by himself, upon the cross, once for all, and a spiritual oblation of all possible praise unto God for the same; so that the Popish sacrifice of the mass, as they call it, is most abominably injurious to Christ's one only sacrifice, the alone propitiation for all the sins of the elect.
→ XXIX.2 · Of the Lord's SupperXXIX.3 The Lord Jesus hath, in this ordinance, appointed his ministers to declare his word of institution to the …
The Lord Jesus hath, in this ordinance, appointed his ministers to declare his word of institution to the people, to pray, and bless the elements of bread and wine, and thereby to set them apart from a common to an holy use; and to take and break the bread, to take the cup, and (they communicating also themselves) to give both to the communicants; but to none who are not then present in the congregation.
→ XXIX.3 · Of the Lord's SupperXXIX.4 Private masses, or receiving this sacrament by a priest, or any other, alone; as likewise the denial of …
Private masses, or receiving this sacrament by a priest, or any other, alone; as likewise the denial of the cup to the people; worshipping the elements, the lifting them up, or carrying them about for adoration, and the reserving them for any pretended religious use, are all contrary to the nature of this sacrament, and to the institution of Christ.
→ XXIX.4 · Of the Lord's SupperXXIX.5 The outward elements in this sacrament, duly set apart to the uses ordained by Christ, have such relation …
The outward elements in this sacrament, duly set apart to the uses ordained by Christ, have such relation to him crucified, as that truly, yet sacramentally only, they are sometimes called by the name of the things they represent, to wit, the body and blood of Christ; albeit, in substance and nature, they still remain truly, and only, bread and wine, as they were before.
→ XXIX.5 · Of the Lord's SupperXXIX.6 That doctrine which maintains a change of the substance of bread and wine, into the substance of Christ's …
That doctrine which maintains a change of the substance of bread and wine, into the substance of Christ's body and blood (commonly called transubstantiation) by consecration of a priest, or by any other way, is repugnant, not to Scripture alone, but even to common sense and reason; overthroweth the nature of the sacrament; and hath been, and is the cause of manifold superstitions, yea, of gross idolatries.
→ XXIX.6 · Of the Lord's SupperXXIX.7 Worthy receivers, outwardly partaking of the visible elements in this sacrament, do then also inwardly by faith, really …
Worthy receivers, outwardly partaking of the visible elements in this sacrament, do then also inwardly by faith, really and indeed, yet not carnally and corporally, but spiritually, receive and feed upon Christ crucified, and all benefits of his death: the body and blood of Christ being then not corporally or carnally in, with, or under the bread and wine; yet as really, but spiritually, present to the faith of believers in that ordinance, as the elements themselves are, to their outward senses.
→ XXIX.7 · Of the Lord's SupperXXIX.8 Although ignorant and wicked men receive the outward elements in this sacrament, yet they receive not the thing …
Although ignorant and wicked men receive the outward elements in this sacrament, yet they receive not the thing signified thereby; but by their unworthy coming thereunto are guilty of the body and blood of the Lord, to their own damnation. Wherefore all ignorant and ungodly persons, as they are unfit to enjoy communion with him, so are they unworthy of the Lord's table, and can not, without great sin against Christ, while they remain such, partake of these holy mysteries, or be admitted thereunto.
→ XXIX.8 · Of the Lord's SupperIn the Westminster Shorter Catechism
Q.96 What is the Lord's Supper?
The Lord's Supper is a sacrament, 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 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.
→ Open Q.96Q.97 What is required for the worthy receiving of the Lord's Supper?
It is required of them that would worthily 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.
→ Open Q.97