Those who have fallen asleep before the coming of the Lord are those
The phrase "those who have fallen asleep before the coming of the Lord" refers to people who have died physically before the return of Jesus Christ. This expression is used in the Bible to describe believers who have passed away, and it emphasizes the hope of resurrection and eternal life for those who have put their faith in Jesus.
Therefore, the answer is "dead physically." It does not refer to people who are sleeping naturally, dead spiritually, or unfaithful.