White Robes Were Given
Revelation 6:11
What are these white robes?
Isaiah 61:10 I will greatly rejoice in Yahuweh, my soul shall be joyful in my God; for he hath clothed me with the garments of salvation, he hath covered me with the robe of righteousness, as a bridegroom decketh himself with ornaments, and as a bride adorneth herself with her jewels.  11For as the earth bringeth forth her bud, and as the garden causeth the things that are sown in it to spring forth; so Yahuweh who saves, GOD will cause righteousness and praise to spring forth before all the nations.
Psalm 132:9 Let thy priests be clothed with righteousness; and let thy saints shout for joy.
There is a purging to come to purity.
Daniel 11:35 And some of them of understanding shall fall, to try them, and to purge, and to make them white, even to the time of the end: because it is yet for a time appointed.
Daniel 12:10 Many shall be purified, and made white, and tried; but the wicked shall do wickedly: and none of the wicked shall understand; but the wise shall understand.
Isaiah 57:1-2 The righteous perisheth, and no man layeth it to heart: and merciful men are taken away, none considering that the righteous is taken away from the evil to come.   2He shall enter into peace: they shall rest in their beds, each one walking in his uprightness.
Revelation 3:2-4 Be watchful, and strengthen the things which remain, that are ready to die: for I have not found thy works perfect before God. 3Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee. 4Thou hast a few names even in Sardis which have not defiled their garments; and they shall walk with me in white: for they are worthy.
Revelation 3:18 I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.
Revelation 6:11 And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellow servants also and their brethren, that should be killed as they were, should be fulfilled.
Revelation 7:9 After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;
These are the caught up saints.
Revelation 15:6 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
These went through the 1st half of the tribulation and were martyred. Chapter 16 tells who killed them and what is going to happen to the marked ones.
Revelation 19:7-8 Let us be glad and rejoice, and give honour to him: for the marriage of the Lamb is come, and his wife hath made herself ready. 8And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints.