ESV Study Bible on John 13:10
Jesus applies the footwashingin another way. Those who have been washed through Jesus’ once-for-all death also need daily cleansing of their sins (symbolized by their frequent need to wash their feet). It is apparent that Jesus applies the footwashingfiguratively since he says not all are clean, referring to Judas, but clearly he cleaned Judas’s feet as well. Because Judas is not spiritually cleansed, unlike Peter, he does not have a “share” (v. 8) with Jesus.
Crossway Bibles. (2008). The ESV Study Bible (pp. 2050–2051). Wheaton, IL: Crossway Bibles.