Jesus is the Source of that river. Out of His riven side flows water and blood, cleansing and life.
He who believes in Me, as the Scripture has said, out of his heart shall flow rivers of living water.” By this He spoke of the Spirit, whom those who believe in Him would receive. For the Holy Spirit was not yet given, because Jesus was not yet glorified. John 7:38-39 MEV
Jesus is risen glorified and has poured out His Spirit. The River of God is flowing like never before.