"22Jesus answered, “If I want him to remain alive until I return, what is that to you? You must follow me.” 23Because of this, the rumor spread among the believers that this disciple would not die. But Jesus did not say that he would not die; he only said, “If I want him to remain alive until I return, what is that to you?”"
https://biblehub.com/niv/john/21.htm
"wandering Jew, in Christian legend, character doomed to live until the end of the world"
https://www.britannica.com/topic/wandering-Jew