What does the Bible say about martyrs in Revelation?

In Revelation 6:9-11, the martyrs are depicted as souls who have been slain for their unwavering testimony of Jesus Christ and the Word of God. They represent those who have refused to compromise their faith, resulting in persecution and death. Their cries for justice illustrate their longing for God's righteous retribution against their oppressors. The passage reassures believers that, despite their suffering, they are recognized by God and will be avenged according to His sovereign will.