"In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink. He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water." - John 7:37-38 KJV
"The word "innermost being" is the Greek koilos, meaning hole or empty place. It is often translated belly or womb. In Jn 7, Jesus is describing a spiritual empty place in the heart of man, not a physical belly or womb. This empty place is the source of thirst and the divine solution to this hunger/thirst is to fill it with living water from the Holy Spirit." -Quote