“God is spirit, and his worshipers must worship in the Spirit and in truth.”” - John 4:24
Jesus has met a Samaritan woman at Jacob’s well, and told her her life story, and offered her salvation. She wonders how she could be saved as she had made her choices. And here he offers her the water of life. But there is more to the backstory.
Samaritans and Jews didn’t mix well. They were all from the twelve tribes, but the Samaritans felt the mountain was holy whereas the Jews had a temple. The woman is being very flirty in talking to Jesus at all. It would have been highly inappropriate and might have initiated a fight had a male Samaritan been present. Jesus does not spurn her but tells her he has something she wants. She questions his authority, referencing her ancestor Jacob, which they have in common.
Jesus answers that anyone who drinks from the well water will be thirsty again. But those who drink from the water of life will never thirst again. Ever flirty, the woman asks for that water. Jesus tells her to bring her husband. And then Jesus reveals he knows exactly who she is. She has made choices which customarily would exclude her from the possibility of salvation. Jesus points out the time is coming when neither the mountain nor the temple would be the special place for one to approach God. Because God is spirit.