John 21 · a question people ask
Did Jesus say that the disciple whom Jesus loved would not die?
No, and the book says so itself. Jesus said to Peter, "If I desire that he stay until I come, what is that to you? You follow me." (21:22). Then: "This saying therefore went out among the brothers that this disciple wouldn’t die. Yet Jesus didn’t say to him that he wouldn’t die, but, “If I desire that he stay until I come, what is that to you?”" (21:23). The book doesn't say who the brothers are, or what until I come means, and these notes don't either. Favor's chapter on John 14 asks when and how Jesus will come, setting his sayings there side by side; this chapter doesn't ask it again.
The verses
“Jesus said to him, “If I desire that he stay until I come, what is that to you? You follow me.” This saying therefore went out among the brothers that this disciple wouldn’t die. Yet Jesus didn’t say to him that he wouldn’t die, but, “If I desire that he stay until I come, what is that to you?””
“If I go and prepare a place for you, I will come again and will receive you to myself; that where I am, you may be there also.”