Why is the concept of the covenant significant in Revelation?

The concept of the covenant is significant in Revelation as it embodies the unchanging promises of God to His people. In Revelation 10, the rainbow on the mighty angel's head serves as a powerful symbol of God's covenant mercy, reminding us of His faithfulness. It reflects the assurance given to Noah that the earth would not be destroyed by a flood again and points to the eternal covenant made before the foundation of the world, where God chose His elect and established their salvation through Christ. This steadiness of God's covenant is a source of comfort and hope for believers amid trials and persecutions.