In the Book of Revelation, the fifth seal, after the first four seals of the four horsemen, was about those slain for the word of God. The most common interpretation of this passage is that these were the martyrs who believed in Jesus Christ as their Savior during the first century. Somehow, these martyrs were under the heavenly altar. They had sacrificed their lives as an act of worship to God. These believers were martyred because they held fast to the Scriptures and shared the gospel with others. John saw their souls under the altar in heaven. He heard them cry out to God for vengeance. Have you ever known a martyr?