Revelation 7, The 144,000 and the Multitude of Martyred Tribulation Saints
Chapter 7 is a parenthesis between the 6th seal and the 7th seal.
Make a joyful noise unto the LORD, all ye lands. Serve the LORD with gladness: come before his presence with singing. Know ye that the LORD he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture. ~ Psalm 100:1-3