Jesus told the Samaritan woman that true worshipers worship the Father in spirit and in what?

Answer: Truth

Jesus said, "God is Spirit, and His worshipers must worship Him in spirit and in truth."

“But a time is coming and has now come when the true worshipers will worship the Father in spirit and in truth, for the Father is seeking such as these to worship Him. God is Spirit, and His worshipers must worship Him in spirit and in truth.””— John 4:23-24 (BSB)