The phrase "Him who is and was and is to come" is a profound biblical title that encapsulates the eternal nature and sovereignty of God. This title is prominently found in the Book of Revelation, specifically in Revelation 1:4 and Revelation 4:8, where it is used to describe the Almighty God, emphasizing His eternal existence and unchanging nature.

Biblical References:

1. Revelation 1:4 : "John, To the seven churches in the province of Asia: Grace and peace to you from Him who is and was and is to come, and from the seven Spirits before His throne."

2. Revelation 4:8 : "And each of the four living creatures had six wings and was covered with eyes all around and within. Day and night they never stop saying: 'Holy, holy, holy is the Lord God Almighty, who was and is and is to come!'"

Theological Significance:

The title "Him who is and was and is to come" underscores the concept of God's eternal presence. It reflects the idea that God transcends time, existing in the past, present, and future simultaneously. This is a foundational attribute of God, affirming His omnipresence and omnipotence. The title assures believers of God's unchanging nature and His sovereign control over history and the future.

Old Testament Parallels:

The concept of God's eternal nature is not new to the New Testament. It echoes the Old Testament revelation of God as the "I AM" in Exodus 3:14, where God reveals Himself to Moses as "I AM WHO I AM." This self-identification signifies God's self-existence and eternal presence. The title in Revelation builds upon this foundational understanding, expanding it to encompass all of time.

Christological Implications:

In the context of Revelation, the title also has Christological implications. Jesus Christ, as the second person of the Trinity, shares in this eternal nature. Revelation 1:8 states, "I am the Alpha and the Omega, says the Lord God, who is and was and is to come, the Almighty." This verse is often understood to refer to both God the Father and Jesus Christ, highlighting the unity and co-eternity of the Father and the Son.

Liturgical Use:

The phrase is used in Christian liturgy and hymns to express worship and adoration of God's eternal majesty. It serves as a reminder of God's faithfulness throughout all ages and His ultimate plan for creation. The continuous praise of the four living creatures in Revelation 4:8 reflects the ceaseless worship that God deserves from all creation.

Eschatological Hope:

For believers, the title "Him who is and was and is to come" provides eschatological hope. It assures them that God, who has been faithful in the past and is present in their lives now, will also be faithful in the future. This hope is central to the Christian faith, especially in the context of the apocalyptic literature of Revelation, which anticipates the ultimate fulfillment of God's promises and the establishment of His eternal kingdom.

In summary, "Him who is and was and is to come" is a title that encapsulates the eternal, unchanging, and sovereign nature of God, providing assurance and hope to believers throughout the ages.