NET
9 Now when the Lamb opened the fifth seal, I saw under the altar the souls of those who had been violently killed because of the word of God and because of the testimony they had given.
Darby
9 And when it opened the fifth seal, I saw underneath the altar the souls of them that had been slain for the word of God, and for the testimony which they held;
KJV
9 And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: