He who is washed needeth not to wash more than his feet, but is altogether clean. First, he says that believers are altogether clean; not that they are in every respect pure, so that there no longer remains in them any stain, but because they are cleansed in their chief part; that is, when sin is deprived of its kingly power, so that the righteousness of God holds the superiority; just as if we were to say, that a body was altogether healthy, Because it was not infected with any universal disease. It is by newness of life, therefore, that we must testify ourselves to be the disciples of Christ, for he declares that he is the Author of purity in all his followers. Again, the other comparison was also applied to the case in hand, that Peter might not set aside the washing of the feet as foolish; for, as Christ washes from the head to the feet, those whom he receives as his disciples, so, in those whom he has cleansed, the lower part remains to be daily cleansed. The children of God are not altogether regenerated on the first day, so as to aim at nothing but the heavenly life; but, on the contrary, the remains of the flesh continue to dwell in them, with which they maintain a continued struggle throughout their whole life. The term feet, therefore, is metaphorically applied to all the passions and cares by which we are brought into contact with the world; for, if the Holy Spirit occupied every part of us, we would no longer have anything to do with the pollutions of the world; but now, by that part in which we are carnal, we creep on the ground, or at least fix our feet in the clay, and, therefor are to some extent unclean. Thus Christ always finds in us something to cleanse. What is here spoken of is not the forgiveness of sins, but the renewal, by which Christ, by gradual and uninterrupted succession, delivers his followers entirely from the sinful desires of the flesh. And you are clean. This proposition may be said to be the minor in the syllogism, and hence it follows that the washing of the feet applies to them with strict propriety. But not all. This exception is added, that every one may examine himself, if Judas may perhaps be moved by a feeling of repentance; though he intended by it to take an early opportunity of fortifying the rest of the disciples, that they might not be perplexed by the atrocity of the crime, which was soon afterwards to be made known. Yet he purposely abstains from naming him, that he may not shut against him the gate of repentance. As that hardened hypocrite [1] was utterly desperate, the warning served only to aggravate his guilt; but it was of great advantage to the other disciples, for by means of it the Divinity of Christ was more fully made known to them, and they likewise perceived that purity is no ordinary gift of the Holy Spirit.

Footnotes

1 - "Cest hypocrite effronte."

He that is washed - This is a difficult passage, and interpreters have been divided about its meaning. Some have supposed that it was customary to bathe before eating the paschal supper, and that the apostles did it; Jesus having said, "he that hath bathed his body is clean except in regard to his feet - to the dirt contracted in returning from the bath, and that there was need only that the feet should be washed in order to prepare them properly to receive the supper." They suppose, also, that the lesson which Jesus meant to teach was that they were really pure John 15:3; that they were qualified to partake of the ordinances of religion, and needed only to be purified from occasional blemishes and impurities (Grotius). Others say that there is not evidence that the Jews bathed before partaking of the Paschal Supper, but that reference is made to the custom of washing their hands and their face. It is known that this was practiced. See the Matthew 15:2 note; Mark 7:3-4 notes. Peter had requested him to wash his hands and his head. Jesus told him that as that had been done, it was unnecessary to repeat it; but to wash the feet was an act of hospitality, the office of a servant, and that all that was needed now was for him to show this condescension and humility. Probably reference is had here to internal purity, as Jesus was fond of drawing illustrations from every quarter to teach them spiritual doctrine; as if he had said, "You are clean by my word and ministry John 15:3; you are my followers, and are prepared for the scene before you. But one thing remains. And as, when we come to this rite, having washed, there remains no need of washing except to wash the feet, so there is now nothing remaining but for me to show you an example that you will always remember, and that shall complete my public instructions to you."
Is clean - This word may apply to the body or the soul.
Every whit - Altogether, wholly.
Ye are clean - Here the word has doubtless reference to the mind and heart.
But not all - You are not all my true followers, and fitted for the ordinance before us.

He that is washed - That is, he who has been in the bath, as probably all the apostles had lately been, in order to prepare themselves the better for the paschal solemnity; for on that occasion, it was the custom of the Jews to bathe twice.
Needeth not save to wash his feet - To cleanse them from any dirt or dust that might have adhered to them, in consequence of walking from the bath to the place of supper. The washing, therefore, of the feet of such persons was all that was necessary, previously to their sitting down to table; The Hindoos walk home from bathing barefoot, and, on entering the house wash their feet again. To this custom our Lord evidently alludes.
If these last words of our Lord had any spiritual reference, it is not easy to say what it was. A common opinion is the following: He who is washed - who is justified through the blood of the Lamb, needeth only to wash his feet - to regulate all his affections and desires; and to get, by faith, his conscience cleansed from any fresh guilt, which he may have contracted since his justification.
Ye are clean, but not all - Eleven of you are upright and sincere; the twelfth is a traitor. So it appears he had washed the feet of all the twelve; but as no external ablutions can purify a hypocrite or a traitor, therefore Judas still remained unclean.

Jesus saith to him, he that is washed,.... Not he that is baptized; for every such person is not wholly clean, but he who is regenerated by the Spirit of God, or rather, who is washed in the blood of Christ: such an one "is clean every whit"; is all over clean; not that he has no sin in him, nor commits any; but as he is washed in the blood of Christ, and justified by his righteousness, he is wholly and entirely clean in the sight of God; for he is justified from all things he could not be justified from by the law of Moses; all his sins are pardoned, and he is perfectly righteous before God; and so is perfectly clean through the word or sentence of justification and absolution pronounced on him, which must be understood in a forensic or law sense. And such an one
needeth not, save to wash his feet, but is clean every whit; the feet of his life and conversation, which are continually gathering dirt, and need daily washing in the blood of Christ; and therefore recourse must be constantly had to that fountain to wash in, for sin and for uncleanness. The allusion is either to persons washed all over in a bath, who have no need to wash again, unless their feet, which may contract some soil in coming out of it; or to travellers, who have often need to wash their feet, though no other part, and such is the case of the children of God in this life; or rather to the priests, who having bathed themselves in the morning, needed not to wash again all the day, except their hands and feet, on certain occasions (x).
And ye are clean, but not all; which shows, that justifying and regenerating grace are common to all the true disciples of Christ; they are equally born again, alike justified, and are as clean one as an other in the sight of God; not only Peter, but all the apostles, were clean, excepting one; there was one of them, Judas, who was not clean; and therefore he says, but not all: whence it may be observed, that among the purest societies, there are some unclean persons; there was a Judas, an unclean person among the pure disciples of Christ; there are chaff and tares among his wheat, goats among his sheep, and foolish virgins along with the wise ones.
(x) Misn. Yoma, c. 3. sect. 3.

He that is washed--in this thorough sense, to express which the word is carefully changed to one meaning to wash as in a bath.
needeth not--to be so washed any more.
save to wash his feet--needeth to do no more than wash his feet (and here the former word is resumed, meaning to wash the hands or feet).
but is clean every whit--as a whole. This sentence is singularly instructive. Of the two cleansings, the one points to that which takes place at the commencement of the Christian life, embracing complete absolution from sin as a guilty state, and entire deliverance from it as a polluted life (Revelation 1:5; 1-Corinthians 6:11) --or, in the language of theology, Justification and Regeneration. This cleansing is effected once for all, and is never repeated. The other cleansing, described as that of "the feet," is such as one walking from a bath quite cleansed still needs, in consequence of his contact with the earth. (Compare Exodus 30:18-19). It is the daily cleansing which we are taught to seek, when in the spirit of adoption we say, "Our Father which art in heaven . . . forgive us our debts" (Matthew 6:9, Matthew 6:12); and, when burdened with the sense of manifold shortcomings--as what tender spirit of a Christian is not?--is it not a relief to be permitted thus to wash our feet after a day's contact with the earth? This is not to call in question the completeness of our past justification. Our Lord, while graciously insisting on washing Peter's feet, refuses to extend the cleansing farther, that the symbolical instruction intended to be conveyed might not be marred.
and ye are clean--in the first and whole sense.
but not all--important, as showing that Judas, instead of being as true-hearted a disciple as the rest at first, and merely falling away afterwards--as many represent it--never experienced that cleansing at all which made the others what they were.

He that is washed needeth not save to wash his feet. We must seek the spiritual meaning. He who is once cleansed by the blood of Christ only needs, after this, to come to Christ for partial cleansing; for the forgiveness of the special sins that make him unclean.

And so ye, having been already cleansed, need only to wash your feet - That is, to walk holy and undefiled.