Jesus saith unto him, What is that to thee? and He then repeats, Follow thou Me, as if John would not follow Him, because he wished to remain till He came; Then went this saying abroad among the disciples, that that disciple should not die. Was it not a natural inference of the disciple’s? But John himself does away with such a notion: Yet Jesus said not unto him, He shall not die; but, If I will that he tarry till I come, what is that to thee? But if any so will, let him contradict, and say that what John says is true, viz. that our Lord did not say that that disciple should not die, but that nevertheless this was signified by using such words as John records.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Tract. cxxiv