What does the Bible say about Christ's pre-existence?

The doctrine of Christ's pre-existence is foundational in understanding the eternal nature, glory, and stability of the covenant of grace formed by the triune God on behalf of the church. This covenant is made by Jehovah, who embodies holiness, love, and mercy. It becomes glorious as the Second Person of the Trinity, Jesus, assumes the role of its surety. Furthermore, it is stable because of its eternal nature and is administered by Christ, who died and rose again to secure its promises for His people.

When believers come into this covenant through the grace of the Holy Spirit, God promises to never turn away from them and to instill His fear in their hearts, ensuring they will not depart from Him. The blood of Jesus, referred to as the blood of the New Testament, affirms the everlasting nature of this covenant. Thus, the love of Christ for His church is just as eternal as His being, providing rich spiritual blessings for those who are elect and thus reminding them of their eternal security in Him.