Revelation 19 is a continuation of Revelation 18:
Revelation 19:1–9: The celebration of the redeemed in heaven.
Revelation 19:11–21: Goes back time to the seventh plague, when God's remnant was delivered. The rider on the white horse and his forces triumph over the earthly kings, the beast, and the false prophet in the battle of Armageddon.
Revelation Chapter 19 verse 1 to 6
1 And after these things I heard a great voice of much people in heaven, saying, Alleluia; Salvation, and glory, and honour, and power, unto the Lord our God:
2 For true and righteous are his judgments: for he hath judged the great whore, which did corrupt the earth with her fornication, and hath avenged the blood of his servants at her hand.
3 And again they said, Alleluia And her smoke rose up for ever and ever.
4 And the four and twenty elders and the four beasts fell down and worshipped God that sat on the throne, saying, Amen; Alleluia.
5 And a voice came out of the throne, saying, Praise our God, all ye his servants, and ye that fear him, both small and great.
6 And I heard as it were the voice of a great multitude, and as the voice of many waters, and as the voice of mighty thunderings, saying, Alleluia: for the Lord God omnipotent reigneth.
After seeing the scenes from chapters 17 and 18, the people are praising God for judging the Babylonian harlot and avenging the blood of the martyrs.
Because God has judged the harlot and avenged the blood of his saints, the righteous are now in heaven.
Revelation 6:10 depicts the martyrs slaughtered by the harlot over a period of 1260 years, who cried out to God to judge and avenge their blood.
The plagues, notably the sixth and seventh, reflect the vengeful aspect of the martyrs' cry.
Revelation Chapter 19 verse 7 to 9
7 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.
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.
9 And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.
“That great city, the holy Jerusalem,” is the bride, which is the Lamb's wife (Revelation 21:2, 9–10).
As the capital of the new earth, the New Jerusalem stands in for "the kingdoms of this world," which are to "become the kingdoms of our Lord and of his Christ." (Revelation 11:15; 21:1–5)
The tree of life will still be present in the New Jerusalem (Revelation 22:1-2).
The marriage that is being discussed here is when Christ accepts His kingdom, which is symbolized by the New Jerusalem, and is crowned as King of kings and Lord of lords in heaven at the end of His priestly ministry, just before the plagues are released (Revelation 17:14).
The parable of the Ten Virgins (Revelation 19:9; Matthew 25:1–10) portrays the waiting saints as guests invited to the wedding.
Fine linen represents a righteous character (Revelation 3:5; 6:11; Revelation 3:18; Revelation 22:14).
Revelation Chapter 19 verse 10 to 21
10 And I fell at his feet to worship him. And he said unto me, See thou do it not: I am thy fellowservant, and of thy brethren that have the testimony of Jesus: worship God: for the testimony of Jesus is the spirit of prophecy.
11 And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.
12 His eyes were as a flame of fire, and on his head were many crowns; and he had a name written, that no man knew, but he himself.
13 And he was clothed with a vesture dipped in blood: and his name is called The Word of God.
14 And the armies which were in heaven followed him upon white horses, clothed in fine linen, white and clean.
15 And out of his mouth goeth a sharp sword, that with it he should smite the nations: and he shall rule them with a rod of iron: and he treadeth the winepress of the fierceness and wrath of Almighty God.
16 And he hath on his vesture and on his thigh a name written, King Of Kings, And Lord Of Lords.
17 And I saw an angel standing in the sun; and he cried with a loud voice, saying to all the fowls that fly in the midst of heaven, Come and gather yourselves together unto the supper of the great God;
18 That ye may eat the flesh of kings, and the flesh of captains, and the flesh of mighty men, and the flesh of horses, and of them that sit on them, and the flesh of all men, both free and bond, both small and great.
19 And I saw the beast, and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse, and against his army.
20 And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone.
21 And the remnant were slain with the sword of him that sat upon the horse, which sword proceeded out of his mouth: and all the fowls were filled with their flesh.
The Bible primarily uses horses for military or government-related purposes (Exodus 15:21; Isaiah 43:17; Jeremiah 8:6; Ezekiel 38:15; Zechariah 10:3; Revelation 14:20). In this context, the horse is associated with battle.
White symbolizes justice and righteousness. In all these judgment scenes, Christ is most associated with the color white, and light is the garment of divine grandeur.
It is important to keep in mind that eastern names often reflect character (Acts 3:16); thus, the names given to Christ here particularly refer to Him in His capacity as the defender of His oppressed people on earth. Revelation 19:11–21 makes four claims about the name of Christ in relation to the war.
Christ is called "Faithful and True" (verse 11) because He is now showing up to deliver His people in accordance with His promise (John 14:1–3). Although He appeared to be delaying His arrival to them (Revelation 16:15), they "have waited for him," and He now shows up to complete their salvation. (Isaiah 25:9; Revelation 16).
In verse 12, the phrase "name written that no man knew but he himself" alludes to the previously unknown role He now plays as the defender of His people (John 16:1). Both humans and angels are unfamiliar with the role He plays in the performance of this "strange" work (Isaiah 28:21).
Despite his role as their defender and source of vengeance, He remains "the Word of God." (verse 13) He is "The Word of God" at work, bringing out the Father's purpose on earth, both in mercy and judgment at this time (John 1:1–3; Revelation 19:15).
Verse 16 refers to Christ as the "King of Kings and Lord of Lords" at this point. (See notes on Revelation 17:14.) He now wields absolute power. (I Corinthians 15:25) Satan aspired to be in God's position (Isaiah 14:12–14; Revelation 12:7-9).
The blood of His enemies, not His own, drenches Jesus' clothing. As he tramples the grapes in the winepress, the juice splatters across his clothing, resembling blood.
The ancient shepherd's rod had two functions. The crook on one end helped guide the sheep, while the heavy ferrule on the other end, a metal cap or ring to stiffen the rod, transformed it into an assault weapon. This was employed to defend the flock. To deter and eliminate wild creatures that would disperse and destroy it. The time has come for the Good Shepherd to wield His "rod of iron" against the nations, with the aim of rescuing His distressed flock on earth. His ruling or smiting the countries with an iron rod results in their extinction, not their government during the millennium, as some believe.
A "prophet" is someone who speaks on behalf of others. Matthew 11:9. This "prophet" speaks on behalf of the first beast in conjunction with the healing of its "deadly wound" (Revelation 13:12; 17:8), persuading the world to join in its loyalty. Satan misleads and collaborates with apostate Protestantism. (Revelation 13:11–17; 16:14).