John Calvin on John 4:15

15. Give me this water. This woman undoubtedly is sufficiently aware that Christ is speaking of spiritual water; but because she despises him, she sets at naught all his promises; for so long as the authority of him who speaks is not acknowledged by us, his doctrine is not permitted to enter. Indirectly, therefore, the woman taunted Christ, saying, “Thou boastest much, but I see nothing: show it in reality, if thou canst.”

John 4:16-21

16. Jesus saith to her, Go, call thy husband, and come hither. 17. The woman answered, and said to him, I have not a husband. Jesus said to her, Thou hast well said, I have not a husband; 18. For thou hast had five husbands, and he whom thou now hast is not thy husband; in this thou hast told the truth. 19. The woman saith to him, Sir, I see that thou art a Prophet. 20. Our fathers worshipped in this mountain; and you say that Jerusalem is the place where we ought to worship. 21. Jesus saith to her, Woman, believe me, the hour cometh when you shall not worship the Father either in this mountain or in Jerusalem.