What are the promises associated with God's covenant?

The promises inherent in God's covenant are foundational for believers as articulated in Isaiah 55:3. The text assures that if we heed God’s call and come to Him, our souls shall live, signifying eternal life. Furthermore, the covenant is established through the sacrifice of Christ, who mediates the promises secured by His blood. This highlights that salvation is assured not through human effort but through faith in the completed work of Jesus. The 'sure mercies of David' remind us that God's promises are guaranteed and rooted in His unwavering faithfulness to His people.