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 F24.
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.
F24 Misn. Yoma, c. 3. sect. 3.