John Chapter 21, Verse 23
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23: εξηλθεν ουν ο λογος ουτος εις τους αδελφους οτι ο μαθητης εκεινος ουκ αποθνησκει και ουκ ειπεν αυτω ο ιησους οτι ουκ αποθνησκει αλλ εαν αυτον θελω μενειν εως ερχομαι τι προς σε
23: Then went this saying abroad among the brethren, that that
disciple should not die: 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?
23: This saying therefore went abroad among the brethren, that that
disciple should not die. And Jesus did not say to him: He should not
die; but: So I will have him to remain till I come, what is it to thee?
Then went this saying, &c. This mistake arose very naturally --
1st. From the words of Jesus, which might be easily misunderstood to mean that he should not die; and,
2nd. It was probably confirmed when it was seen that John survived all the other apostles, had escaped all the dangers of persecution, and was leading a peaceful life at Ephesus. This mistake John deemed it proper to correct before he died, and has thus left on record what Jesus said and what he meant.

