John 12:4 - Ellicott's Commentary On The Whole Bible

Then saith one of his disciples, Judas Iscariot. — Comp. Notes on John 6:70-71. St. Matthew tells us that the question was asked by “the disciples;” St. Mark, that it was asked by “certain persons;” St. John remembers that it was Judas who spoke, and he remembers that his words were characteristic of the man (John 12:6). He implies by the form in which he relates these words, that he spoke for himself, and that the others did not join in his feeling.