John 21:22, 23
22 Jesus saith unto him, If I will that he [John] tarry till I come, what is that to thee? follow thou me.
23 Then went this saying abroad among the brethren, that that disciple [John] 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?
3 Nephi 28:6,7
6 And he said unto them: Behold, I know your thoughts, and ye have desired the thing which John, my beloved, who was with me in my ministry, before that I was lifted up by the Jews, desired of me.
7 Therefore, more blessed are ye, for ye shall never taste of death; but ye shall live to behold all the doings of the Father unto the children of men, even until all things shall be fulfilled according to the will of the Father, when I shall come in my glory with the powers of heaven.
D&C 7
1 And the Lord said unto me: John, my beloved, what desirest thou? For if you shall ask what you will, it shall be granted unto you.
2 And I said unto him: Lord, give unto me power over death, that I may live and bring souls unto thee.
3 And the Lord said unto me: Verily, verily, I say unto thee, because thou desirest this thou shalt tarry until I come in my glory, and shalt prophesy before nations, kindreds, tongues and people.
4 And for this cause the Lord said unto Peter: If I will that he tarry till I come, what is that to thee? For he desired of me that he might bring souls unto me, but thou desiredst that thou mightest speedily come unto me in my kingdom.
I hope this helps…