John 7:38-39 AMPC
He who believes in Me [who cleaves to and trusts in and relies on Me] as the Scripture has said, From his innermost being shall flow [continuously] springs and rivers of living water.
But He was speaking here of the Spirit, Whom those who believed (trusted, had faith) in Him were afterward to receive. For the [Holy] Spirit had not yet been given, because Jesus was not yet glorified (raised to honor).
AMPC: Amplified Bible, Classic Edition