← Westminster Larger Catechism · Q. 173

May any who profess the faith, and desire to come to the Lord's supper, be kept from it?

☩ Ecclesiology & Worship

Such as are found to be ignorant or scandalous, notwithstanding their profession of the faith, and desire to come to the Lord's supper, may and ought to be kept from that sacrament, by the power which Christ hath left in his church,1 until they receive instruction, and manifest their reformation.2

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 1 Cor. 5; 1 Cor. 11:27–31; Matt. 7:6; Jude 1:23; 1 Tim. 5:22
1 Cor. 5

— full text not shown for this reference —

1 Cor. 11:27–31

1 Cor. 11:27 Wherefore whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord.

1 Cor. 11:28 But let a man examine himself, and so let him eat of that bread, and drink of that cup.

1 Cor. 11:29 For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord’s body.

1 Cor. 11:30 For this cause many are weak and sickly among you, and many sleep.

1 Cor. 11:31 For if we would judge ourselves, we should not be judged.

Matt. 7:6

Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.

Jude 1:23

And others save with fear, pulling them out of the fire; hating even the garment spotted by the flesh.

1 Tim. 5:22

Lay hands suddenly on no man, neither be partaker of other men’s sins: keep thyself pure.

2 2 Cor. 2:7
2 Cor. 2:7

So that contrariwise ye ought rather to forgive him, and comfort him, lest perhaps such a one should be swallowed up with overmuch sorrow.

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 Supper
XXIX.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 Supper
XXIX.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 Supper
XXIX.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 Supper
XXIX.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 Supper
XXIX.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 Supper
XXIX.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 Supper
XXIX.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 Supper

In 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.96
Q.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