God is Spirit, and those who worship Him must worship in spirit and truth."
John 4:24
Surrounding context
4:23 But the hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth; for the Father is seeking such to worship Him.
4:24 God is Spirit, and those who worship Him must worship in spirit and truth."
4:25 The woman said to Him, "I know that Messiah is coming" (who is called Christ). "When He comes, He will tell us all things."