Revelation 16:5 has the angel declaring God's judgments just — the altar echoes that same declaration in context.

Revelation 6:9 shows martyrs under the altar crying for justice; here the altar itself declares God's judgments righteous.

Revelation 8:3-5 has an angel at the altar offering incense and casting fire to earth; the altar here affirms the righteous judgments that follow.

In Revelation 14:10, the same wine of God's wrath is described — the judgment the altar voice affirms as true and righteous.

Revelation 14:18 has an angel from the altar executing the harvest judgment; the altar here proclaims that judgment righteous.

Revelation 15:3 sings 'just and true are Your ways'; the altar echoes 'true and righteous are Your judgments' — identical praise.

Revelation 15:4 declares 'Your judgments have been manifested'; here the altar affirms their righteousness.

In Revelation 19:2, the exact phrase 'true and righteous are His judgments' echoes this altar cry, now applied to Babylon's fall.

Revelation 11:17 thanks God for reigning — connects to the altar's acknowledgment of God's just judgments in judgment scenes.

Psalm 19:9 explicitly states 'the judgments of the Lord are true and righteous' — a direct source for the altar's declaration.

Psalm 119:137 declares 'righteous are You, O Lord, and upright are Your judgments' — directly echoed in the altar's words.

2 Thessalonians 1:5 states God's judgment is right — a direct parallel to the altar's affirmation.