Revelation 6:10-11

10These believers called out loudly, ‘Lord, you have all authority. You are completely good. You always do what is right. When will you decide to judge the people who live on the earth? Do not wait! You should quickly punish the people who killed us!’

11Then each believer received white clothes. God told them to wait for a short time more. They must wait until other believers on earth also died. These believers are also servants of God. God will wait until people kill those believers too. Then the number of them will be complete.