John 4:29 - Ellicott's Commentary On The Whole Bible

Is not this the Christ? — Better, is this the Christ? She felt that He was a prophet when His words revealed her past life (John 4:19). She has had the thought of Christ present to her mind when He teaches the nature of true worship (John 4:25). She has heard that He is the Messiah from His own lips (John 4:26); but she does not frame her question so as to expect the answer “Yes:” she states the fact of His knowing the life, known perhaps to many of them, and leaves them to form their own judgment.