Revelation 6:10
(10) And they cried with a loud voice, saying, “How long, O Lord, holy and true, until You judge and avenge our blood on those who dwell on the earth?”
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This plaintive cry, “How long . . .?” is a New Testament echo of the Old Testament prophets, many of whom were persecuted and slain for their testimony. The psalmists use it most frequently: from David in Psalm 13:1 (“How long, O LORD? Will You forget me forever?”) to Asaph in Psalm 74:10(“O God, how long will the adversary reproach?”) to Moses in Psalm 90:13 (“Return, O LORD! How long? And have compassion on Your servants”). Even Ethan the Ezrahite gets in on the act: “How long, LORD? Will You hide Yourself forever? Will Your wrath burn like fire?” (Psalm 89:46; see also Psalm 6:3; 35:17; 79:5; 80:4; 94:3).
This question continues in both the major and minor prophets. Isaiah writes, “Then I said, ‘Lord, how long?’ And He answered: ‘Until the cities are laid waste and without inhabitant, the houses are without a man, the land is utterly desolate. . .'” (Isaiah 6:11). Later, Habakkuk asks, “O LORD, how long shall I cry, and You will not hear? Even cry out to You, ‘Violence!’ and You will not save” (Habakkuk 1:2; see also Daniel 12:6; Zechariah 1:12). “How long?” has been a constant prayer to God through the ages, especially during times of great distress, particularly when God’s servants are under intense persecution, when the surrounding culture has reached its nadir and the nation is ripe for judgment, or as it often works out, when both are happening simultaneously.
The intent of the request in Revelation 6:10 is for an indication from God of how long the saints have to endure the worst that Satan-inspired humanity can throw at them before He acts on their behalf as He has promised. As early as Deuteronomy 32:43, the conclusion of the Song of Moses, it is promised, “Rejoice, O Gentiles, with His people; for He will avenge the blood of His servants, and render vengeance to His adversaries.” Jesus Himself promises, “And shall God not avenge His own elect who cry out day and night to Him, though He bears long with them? I tell you that He will avenge them speedily” (Luke 18:7-8). Paul later expands this considerably:
. . . it is a righteous thing with God to repay with tribulation those who trouble you, and to give you who are troubled rest with us when the Lord Jesus is revealed from heaven with His mighty angels, in flaming fire taking vengeance on those who do not know God, and on those who do not obey the gospel of our Lord Jesus Christ. These shall be punished with everlasting destruction from the presence of the Lord and from the glory of His power, when He comes, in that Day, to be glorified in His saints and to be admired among all those who believe, because our testimony among you was believed. (II Thessalonians 1:6-10)
There is never a doubt about God’s eventual intervention to avenge the deaths of His saints. God’s promises are sure (Isaiah 46:11; 55:11; Matthew 24:35; John 10:35). Obviously, “How long, O Lord . . .?” is a query about the duration of events until God intervenes, and the souls under the altar ask it, not in impatience or exasperation, but in anticipation of the end of the saints’ tribulations and of the receipt of their reward.
In reading this, however, we must not forget that these martyred saints are dead, resting in their graves, as Revelation 6:11 confirms. Thus, the answer to their question is not for them—they know nothing (Ecclesiastes 9:5), their testimony having finished in death (Acts 20:24; II Timothy 4:7; Revelation 11:7)—but for living saints, who will undergo persecution and eventual martyrdom.
— Richard T. Ritenbaugh