18 Then they also that are fallen asleep in Christ have perished.
1 Corinthians 15:18 Cross References - JPS_ASV_Byz
1 Corinthians 15:6
6 then he appeared to above five hundred brethren at once, of whom the greater part remain until now, but some are fallen asleep,
1 Thessalonians 4:13-14
1 Thessalonians 4:16
16 For the Lord himself shall descend from heaven, with a shout, with the voice of the archangel, and with the trump of God; and the dead in Christ shall rise first,
Revelation 14:13
13 And I heard the voice from heaven saying, Write, Blessed are the dead who die in the Lord from henceforth; yea, saith the Spirit, that they may rest from their labors, and their works follow with them.