John 13:10

Ὁ λελουμένος … ὅλος. “He that has been in the bath has no need to wash save his feet, but is all clean.” His feet may be soiled by walking from the public bath to the supper chamber, and it is enough that they be washed. “Ad convivium vocati solebant prius in balneo lavari; in domo vero convivatoris nonnisi pedes, quibus in via pulvis aut sordes adhaeserant, a servis abluebantur, ne lecti, super quibus accumbebant, macularentur.” Wetstein. He supports the statement by many references. The added clause discloses that a spiritual sense underlies the symbol: ὑμεῖς καθαροί ἐστε, ἀλλʼ οὐχὶ πάντες, “ye are clean, but not all”. All had been washed: the feet of Judas were as clean as those of Peter. But Judas was not clean.