Definition and Scope
Eternal service and worship refer to the perpetual adoration, reverence, and service rendered to God by His creation, particularly by redeemed humanity and the heavenly hosts. This concept is rooted in the understanding of God's eternal nature and His worthiness to be praised and served forever. It encompasses both the present acts of worship by believers and the anticipated eternal worship in the new heavens and new earth.

Biblical Foundations
The Bible presents worship as a central theme, beginning with the creation narrative where humanity is made in the image of God to reflect His glory (Genesis 1:27). Worship is both a duty and a delight, as seen in the Psalms, which frequently call for all creation to praise the Lord. Psalm 145:2 declares, "Every day I will bless You, and I will praise Your name forever and ever."

Eternal Worship in Heaven
The book of Revelation provides vivid imagery of eternal worship in heaven. Revelation 4:8 describes the four living creatures who "day and night never stop saying: 'Holy, holy, holy is the Lord God Almighty, who was, and is, and is to come!'" This ceaseless worship underscores the eternal nature of God's holiness and the unending response of adoration from His creation.

Revelation 7:9-10 depicts a great multitude from every nation, tribe, people, and language standing before the throne and before the Lamb, crying out, "Salvation to our God, who sits on the throne, and to the Lamb!" This scene highlights the inclusivity and diversity of eternal worship, as well as its focus on God's redemptive work through Jesus Christ.

The Role of Angels and Saints
Angels are depicted as active participants in eternal worship. Hebrews 1:6 states, "And again, when God brings His firstborn into the world, He says: 'Let all God’s angels worship Him.'" The heavenly hosts continually serve and worship God, setting an example for believers.

The saints, both those who have gone before and those who will join in the future, are also called to eternal service. Revelation 22:3-4 promises, "No longer will there be any curse. The throne of God and of the Lamb will be within the city, and His servants will worship Him. They will see His face, and His name will be on their foreheads." This passage assures believers of their eternal role in God's presence, free from sin and its effects.

Present Worship as a Foretaste
While eternal worship is a future reality, believers are called to engage in worship now as a foretaste of what is to come. Romans 12:1 urges, "Therefore I urge you, brothers, on account of God’s mercy, to offer your bodies as living sacrifices, holy and pleasing to God, which is your spiritual service of worship." This present worship involves a life of obedience, service, and adoration, reflecting the eternal worship that will be fully realized in God's kingdom.

Conclusion
Eternal service and worship are integral to the Christian faith, emphasizing the perpetual adoration of God by His creation. Rooted in Scripture, this concept points to the ultimate fulfillment of worship in the presence of God, where believers will join the heavenly hosts in unending praise and service.