Jesus remains sovereign over Peter's death and John's future.

John 21:18–22

¹⁸Verily, verily, I say unto thee, When thou wast young, thou girdedst thyself, and walkedst whither thou wouldest: but when thou shalt be old, thou shalt stretch forth thy hands, and another shall gird thee, and carry thee whither thou wouldest not.

¹⁹This spake he, signifying by what death he should glorify God. And when he had spoken this, he saith unto him, Follow me.

²⁰Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?

²¹Peter seeing him saith to Jesus, Lord, and what shall this man do?

²²Jesus saith unto him, If I will that he tarry till I come, what is that to thee? follow thou me.