'Living Water' in the Bible

Jesus answered and said unto her, If thou knewest the gift of God, and who it is that saith to thee, Give me to drink; thou wouldest have asked of him, and he would have given thee living water.

The woman saith unto him, Sir, thou hast nothing to draw with, and the well is deep: from whence then hast thou that living water?

He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.