New Defender's Study Bible Notes
21:22 tarry till I come. Tradition has it that all the twelve disciples except John died as martyrs for their testimony. Peter is said to have been crucified (see John 21:18), possibly upside down, although none of this is confirmed in the Bible itself, except for James, the brother of John (Acts 12:1-2). All the others were probably dead by the time John wrote his gospel, somewhere around A.D. 85. In one sense, he did tarry until the Lord’s coming, for as a prisoner on the isle of Patmos he was translated into the future to see and record all the main events associated with Christ’s return in the book of Revelation (Revelation 1:1-2,10-11).