On the final and most important day of the festival of Sukkot, Jesus stood and shouted, “Anyone who is thirsty should come to me and drink! Just like the Scriptures say, anyone who believes in me will have rivers of living water flowing from their very center.”

He was talking about the Holy Spirit, which his believers were going to receive. The Spirit had not been received yet because Jesus hadn’t yet gone to his glory in heaven.

JN 7:37-39