Thou hast a few names even in Sardis - A few persons, names being put for those who bore them. And as the members of the Church were all enrolled, or their names entered in a book, when admitted into the Church or when baptized, names are here put for the people themselves. See Revelation 3:5.

Have not defiled their garments - Their souls. The Hebrews considered holiness as the garb of the soul, and evil actions as stains or spots on this garb. So in Shabbath, fol. 152, 2: "A certain king gave royal garments to his servants: those who were prudent folded them up, and laid them by in a chest; those who were foolish put them on, and performed their daily labor in them. After some time the king asked for those royal robes; the wise brought theirs white and clean, the foolish brought theirs spotted with dirt. With the former the king was well pleased; with the latter he was angry. Concerning the former he said: Let those garments be laid up in my wardrobe, and let the persons go home in peace. Of the latter he said: Let the garments be put into the hands of the fuller, and cast those who wore them into prison." This parable is spoken on these words of Ecclesiastes, Ecclesiastes 12:7 : The spirit shall return to God who gave it.

They shall walk with me in white - They shall be raised to a state of eternal glory, and shall be for ever with their Lord.

names.

Revelation 11:13 And the same hour was there a great earthquake, and the tenth part of the city fell...

*Gr:

Acts 1:15 And in those days Peter stood up in the middle of the disciples, and said...

even.

1 Kings 19:18 Yet I have left me seven thousand in Israel, all the knees which have not bowed to Baal, and every mouth which has not kissed him.

Isaiah 1:9 Except the LORD of hosts had left to us a very small remnant, we should have been as Sodom, and we should have been like to Gomorrah.

Romans 11:4-6 But what said the answer of God to him? I have reserved to myself seven thousand men, who have not bowed the knee to the image of Baal...

which.

Revelation 7:14 And I said to him, Sir, you know. And he said to me, These are they which came out of great tribulation, and have washed their robes...

Revelation 19:8 And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints.

Isaiah 52:1 Awake, awake; put on your strength, O Zion; put on your beautiful garments, O Jerusalem, the holy city...

Isaiah 59:6 Their webs shall not become garments, neither shall they cover themselves with their works: their works are works of iniquity...

Isaiah 61:3,10 To appoint to them that mourn in Zion, to give to them beauty for ashes, the oil of joy for mourning...

Isaiah 64:6 But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities...

Zechariah 3:3-6 Now Joshua was clothed with filthy garments, and stood before the angel...

Jude 1:23 And others save with fear, pulling them out of the fire; hating even the garment spotted by the flesh.

walk.

Revelation 3:5,18 He that overcomes, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life...

Revelation 4:4 And round about the throne were four and twenty seats: and on the seats I saw four and twenty elders sitting, clothed in white raiment...

Revelation 6:11 And white robes were given to every one of them; and it was said to them, that they should rest yet for a little season...

Revelation 7:9,13 After this I beheld, and, see, a great multitude, which no man could number, of all nations, and kindreds...

Revelation 19:14 And the armies which were in heaven followed him on white horses, clothed in fine linen, white and clean.

Esther 8:15 And Mordecai went out from the presence of the king in royal apparel of blue and white, and with a great crown of gold...

Psalm 68:14 When the Almighty scattered kings in it, it was white as snow in Salmon.

Ecclesiastes 9:8 Let your garments be always white; and let your head lack no ointment.

Zechariah 3:4 And he answered and spoke to those that stood before him, saying, Take away the filthy garments from him. And to him he said, Behold...

Mark 16:5 And entering into the sepulcher, they saw a young man sitting on the right side, clothed in a long white garment...

for.

Matthew 10:11 And into whatever city or town you shall enter, inquire who in it is worthy; and there abide till you go there.

Luke 20:35 But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry...

Luke 21:36 Watch you therefore, and pray always, that you may be accounted worthy to escape all these things that shall come to pass...

2 Thessalonians 1:5 Which is a manifest token of the righteous judgment of God, that you may be counted worthy of the kingdom of God...

The Loved Ones Chastened
The fact is, that this world is not the place of punishment. There may now and then be eminent judgments; but as a rule God does not in the present state fully punish any man for sin. He allows the wicked to go on in their wickedness; he throws the reins upon their necks; he lets them go on unbridled in their lusts; some checks of conscience there may be; but these are rather, as monitions than as punishments. And, on the other hand, he casts the Christian down; he gives the most afflictions to the …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 3: 1857

Inspiration.
"And unto the angel of the church in Sardis write, These things saith He that hath the seven Spirits of God."-- Rev. iii. 1. We do not speak here of the New Testament. Nothing has contributed more to falsify and undermine faith in the Scripture and the orthodox view concerning it than the unhistoric and unnatural practise of considering the Scripture of the Old and the New Testament at the same time. The Old Testament appears first; then came the Word in the flesh; and only after that the Scripture …
Abraham Kuyper—The Work of the Holy Spirit

Laodicea
We reach, in this last Epistle, the lowest point of Judah's degradation, in that long line of departure from God, from the day Israel left her "first love," even the day of her espousals, when brought forth out of Egypt, down, down through one vast scene of idolatry and judgment, until we find that nation described in the Epistle to the Assembly in Laodicea in a condition of spiritual destitution such as characterised the People in the period of the Minor Prophets. Indeed, so complete is the correspondence, …
E.W. Bullinger—Commentary on Revelation