Introduction:
The phrase "Him who is true" is a profound biblical expression that refers to the nature and character of God, emphasizing His authenticity, faithfulness, and ultimate reality. This term is primarily found in the New Testament and is closely associated with the person of Jesus Christ, who embodies the truth of God in human form.

Biblical References:
The primary reference to "Him who is true" is found in the First Epistle of John. In 1 John 5:20 , it states: "And we know that the Son of God has come and has given us understanding, so that we may know Him who is true; and we are in Him who is true—in His Son Jesus Christ. He is the true God and eternal life." This passage highlights the intimate relationship between knowing God and knowing Jesus Christ, affirming the deity of Christ and His role as the revelation of God's truth.

Theological Significance:
1. God's Nature as Truth:
The concept of God as "Him who is true" underscores His nature as the ultimate source of truth. In a world filled with deception and falsehood, God stands as the unchanging standard of truth. This truth is not merely factual accuracy but encompasses His faithfulness, reliability, and moral integrity.

2. Jesus Christ as the Embodiment of Truth:
Jesus Christ is the manifestation of God's truth. In John 14:6 , Jesus declares, "I am the way and the truth and the life. No one comes to the Father except through Me." This statement affirms that Jesus is the definitive revelation of God's truth, providing the only path to a relationship with the Father.

3. The Believer's Relationship with Truth:
Believers are called to live in the truth by abiding in Christ. As 1 John 5:20 indicates, knowing "Him who is true" is made possible through the understanding given by the Son of God. This relationship is not merely intellectual but transformative, as believers are called to reflect God's truth in their lives.

4. Contrast with Falsehood:
The biblical narrative often contrasts God's truth with the falsehood of the world. In 1 John 2:21 , it is written, "I have not written to you because you do not know the truth, but because you do know it, and because no lie comes from the truth." This contrast serves as a call for discernment and fidelity to God's truth amidst the deceptive influences of the world.

Practical Implications:
1. Faithfulness in Doctrine:
Understanding God as "Him who is true" calls for adherence to sound doctrine. Believers are encouraged to test teachings against the truth of Scripture, ensuring that their faith is grounded in the authentic revelation of God.

2. Integrity in Conduct:
Reflecting the truth of God in one's life involves living with integrity and honesty. As followers of "Him who is true," Christians are called to embody truthfulness in their words and actions, serving as witnesses to God's character.

3. Hope in Eternal Life:
The assurance of eternal life is rooted in the truth of God. As 1 John 5:20 affirms, Jesus Christ is "the true God and eternal life." This promise provides believers with hope and confidence in the face of life's uncertainties, knowing that their faith rests in the unchanging truth of God.

Conclusion:
The expression "Him who is true" encapsulates the essence of God's character and His revelation through Jesus Christ. It calls believers to a life of truth, grounded in the knowledge of God and expressed through faithful living.