In the passage in question, Jesus made the following comment:
"... if anyone keeps My word he shall never see death."
He elaborated on this statement in additional passages, such as John 8:52: "... If anyone keeps My word he shall never taste death." In referring to our participation at the annual Passover service, He stated, in John 6:50, 58: "This is the bread which comes down from heaven, that one may eat of it and not die... He who eats this bread will live forever."
"You are the light of the world. A city that is set on a hill cannot be hidden."
-Matthew 5:14