John 21:20-23

Peter turned and saw that the disciple whom Jesus loved was following them. (This was the one who had leaned back against Jesus at the supper and had said, "Lord, who is going to betray you?") When Peter saw him, he asked, "Lord what about him?" Jesus answered, "If I want him to remain alive until I return, what is that to you? You must follow me." Because 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?"

Peter turned and saw that the disciple whom Jesus loved was following them 
John 21:7  Then the disciple whom Jesus loved said to Peter, "It is the Lord!" As soon as Simon Peter heard him say, "It is the Lord," he wrapped his outer garment around him (for he had taken it off) and jumped into the water.

("Lord, who is going to betray you?") 
John 13:25  Leaning back against Jesus, he asked him, "Lord, who is it?"

If I want him to remain alive until I return 
Matthew 16:27  "For the Son of Man is going to come in his Father's glory with his angels, and then he will reward each person according to what they have done."
Luke 17:30  "It will be like this on the day the Son of Man is revealed." [See Luke 17:20-37]
John 14:3  "And if I go and prepare a place for you, I will come back and take you to be with me that you also may be where I am."
Acts 1:11  "Men of Galilee," they said, "why do you stand here looking into the sky? This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven."
1 Corinthians 1:7  Therefore  you do not lack any spiritual gift as you eagerly wait for our Lord Jesus Christ to be revealed. 
1 Thessalonians 4:16-17  For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God and the dead in Christ will rise first. After that, we who are still alive and are left will be caught up together with them in the clouds to meet the Lord in the air. And so we will be with the Lord forever.

You must follow me  
John 21:19  Jesus said this to indicate the kind of death by which Peter would glorify God. Then he said to him, "Follow me!"
Matthew 4:19  "Come, follow me," Jesus said, "and I will send you out to fish for people."

[brackets are mine]

Scriptures taken from the Holy Bible, New International Version® NIV®, 
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