As noted in the answer to the prior question, “…they are before the throne of God; and they are rendering him sacred service day and night in his temple;” (Rev 7:15 NWT).
Just as in the Old Testament the Levites provided service for the tabernacle (then later the temple) and supported the greater work of the Priests, so the Great Crowd are servants to Christ and the 144,000 Priestly class in God’s temple .
Rev 7:15 says that “the One seated on the throne will spread his tent [tabernacle] over them” (NWT). In contrast, Rev 21:3 says, “The tent [tabernacle] of God is with mankind, and he will reside with them, and they will be his peoples.” (NWT) The Great Crowd are in the tent (from same Greek root word as tabernacle, i.e. Heb 9:2) in the same sense that the Old Testament Levites served in the tabernacle (Num 3:6-8; 16:8,9). “The tent of God is with mankind” (Rev 21:3) in the same way that the tabernacle was with Israel (Lev 26:11; Ex 2:5:8); but only the Priests and Levites were permitted to go near it, not Israel. So, just like the Levites, the Great Crowd will have a special role of service before the throne and in Jehovah’s tabernacle. Yet just as the Levites had a less significant role than the priests, so the Great Crowd will have a less significant role than the Anointed 144,000 who are described as earth’s future priests and kings (Rev 1:6; 20:6, 2 Tim 2:12)
Ezekiel 44 symbolically speaks of the Anointed and Great Crowd. The faithful priests of Ez 44:15,16 will minister to Jehovah in his sanctuary. The Levites who went astray will “bear their error” (Ez 44:9-14 NIV), but they will still serve at the gates of Jehovah’s house. Verse 14 says, “And I shall certainly make them caretakers of the obligation of the House, as regards all its service and as regards all that should be done in it.” (NIV)
This prophecy cannot be referring to the literal Jewish Priests and Levites after the time of Ezekiel, because it was never fulfilled that way. This chapter symbolically refers to the time of Paradise Earth after the door is shut on the foolish virgins (Ez 44:1; Matt 25:10). Ez 44 reveals the roles of the Priests (representing the 144,000) and the Levites (representing the Great Crowd). The Great Crowd is actually of the Anointed during the Gospel Age, but they are not totally faithful and they are drawn to some degree after the idols of this life (vs 12) and become a stumbling block to others.
We are told that “they shall bear their error” (vs 12) and that ” they must bear their humiliation and their detestable things that they did” (vs 13). This is the “great tribulation” that the Great Crowd is said to go through. Rev 7:14 says, “These are the ones that come out of the great tribulation, and they have washed their robes and made them white in the blood of the Lamb.” It is because the Great Crowd spots their robes (tarnishes their justified standing with Jehovah) with sin, that they must go through trying experiences (tribulation) in their life to wash those spots clean. Although this has had a personal application to the Great Crowd throughout the Gospel Age, it seems to have a special application as well to a final trial at the time of the final Great Tribulation at the end of the Gospel Age.