Jesus said to them, "I am the bread of life. He who comes to me will not be hungry, and he who believes in me will never be thirsty.
He that believeth on me shall never thirst ...  This is parallel to the previous clause and means the same, the living water and the bread of life being separate metaphors for one thing only, Jesus Christ.  "Believeth on me ..." should not be understood as an affirmation of the popular superstition regarding salvation by "faith only."  See  John 12:42.