How do we know God's covenant is an eternal one?

The idea of God's covenant being eternal is thoroughly supported by scripture. It is described in passages such as Micah 5, where the origins of the Messiah are noted as being from 'of old,' indicating a preordained plan of redemption. Additionally, Ephesians illustrates that believers are chosen in Christ before the foundation of the world. This eternal covenant assures believers that their salvation is secure, resting not on their actions but on the immutable promise of God through Jesus Christ.