Post tribulation and mid tribulation rapture advocates cannot tell you where these elders came from. They are introduced in chapter 4 of the book of Revelation, with the tribulation beginning after this in chapter six. HOW. DID. THEY. GET. THERE?. Where did they come from?
Revelation shows us essentially 3 groups of people. The elders, the bride, primarily gentiles , and the tribulation martyrs. The raptured saints after the cross appear in rev 5:9-10, “out of all nations” “Kings and priests unto God, and we shall reign on the earth” 1 Thess 4:16-17″the dead in Christ shall rise first” these are the second phase of the first resurrection, shavout, the wheat. The NT saints. These also appear BEFORE the beginning of the tribulation in chapter 6. This is the pre trib rapture.
The tribulation martyrs arrive at the marriage feast DURING the tribulation, (rev 6:9-11, rev 14:16-19)). (see “the first resurrection”, and “our future, Kings and priests unto God”) Another group arrives in Rev 7:9-10 (rev 14:16). After this, the Lord steals away for a moment as it were, returns to earth and defeats the antichrists armies, and casts the devil into the bottomless pit. Ge then opens the door to heavrn, releasing us to return with him. At this time, all the tribulation survivors will be gathered, and separated and judged. MT 25:31-41. We will be judges here.
Pre trib deniers have yet to explain how the elders in the opening chapters BEFORE the trib begins got there in the first place. They lack understanding.