The phrase "The One who is and who was" is a profound biblical expression that encapsulates the eternal nature and unchanging character of God. This designation is primarily found in the Book of Revelation, where it serves to emphasize God's sovereignty, timelessness, and His active presence throughout history.

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 who was and who is to come, and from the sevenfold Spirit before His throne." This verse introduces the triune nature of God, highlighting His eternal existence. The phrase underscores God's presence in the past, present, and future, affirming His unchanging nature and His role as the eternal source of grace and peace.

2. Revelation 1:8 : "'I am the Alpha and the Omega,' says the Lord God, 'who is and who was and who is to come, the Almighty.'" Here, God declares Himself as the beginning and the end, reinforcing His omnipotence and eternal existence. The use of "Alpha and Omega" further illustrates His completeness and the all-encompassing nature of His being.

3. 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!'" This verse depicts the heavenly worship of God, acknowledging His holiness and eternal presence. The continuous praise by the living creatures reflects the perpetual acknowledgment of God's timeless existence.

Theological Significance:

The expression "The One who is and who was" is deeply rooted in the understanding of God's eternal nature. It affirms that God exists beyond the constraints of time, having no beginning or end. This concept is foundational to the Christian belief in God's immutability, meaning He is unchanging in His nature, will, and promises.

In the context of Revelation, this title serves to comfort and assure believers of God's sovereign control over history and the future. It reminds the faithful that despite the trials and tribulations they may face, God remains constant and His purposes will ultimately prevail.

Old Testament Parallels:

The idea of God's eternal nature is not limited to the New Testament. In the Old Testament, God reveals Himself to Moses as "I AM WHO I AM" (Exodus 3:14), a declaration of His self-existence and eternal presence. This self-identification as "I AM" resonates with the description of God as "The One who is and who was," further establishing the continuity of God's revelation throughout Scripture.

Implications for Believers:

For believers, the recognition of God as "The One who is and who was" provides a foundation for faith and trust. It assures them that God is ever-present, actively involved in their lives, and faithful to His promises. This understanding encourages Christians to live with confidence, knowing that the God they serve is eternal, unchanging, and sovereign over all creation.