The two resurrections according to scripture.
4. The Two Resurrections | Bible.org
What Christ is referring to, is the contentment of companionship, when one is taken and the other is left. Christ teaches the believer to be ready! Blessed are they who have part in the first resurrection (Revelation 20:6). This only happens when Christ returns and there is no such thing as a magical rapture! The apostles wanted to live in this last day but also died for Christ! That is true faith when one can say they would die for Jesus Christ, and that will be the test!
AND
Man is appointed to die once: Hebrews 9:27 Just as man is appointed to die once, and after that to face judgment, (biblehub.com)