The Wandering Jew is a figure from Christian folklore. The legend relates that a Jewish shoemaker, taunting Jesus on the way to crucifixion, was told by him "thou shalt go on forever till I return". The shoemaker was thus punished for his indiscretion by being forced to wander the earth until the second coming of Jesus.
Others trace it to the Matthew 16:28:
Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom
http://en.wikipedia.org/wiki/The_wandering_jew