In 1 John 5:11, the testimony that God gives eternal life through His Son is the foundation for the assurance stated here.

In 1 John 5:19, the parallel assurance 'we know we are from God' contrasts believers with the world under evil.

In 1 John 2:1, the writing aims to prevent sin and introduce Jesus as our Advocate—expanding the purpose beyond assurance to holy living.

In 1 John 1:4, the same author states another purpose for writing: 'that your joy may be full'—linking assurance of eternal life to joy.

In 1 John 3:23, the same command to believe in Jesus' name is given — the very belief that grants eternal life in 5:13.

1 John 1:2 explicitly proclaims that eternal life appeared in Christ, directly supporting the assurance in 1 John 5:13.

1 John 1:1 grounds the assurance of eternal life in the apostolic witness to the incarnate Word of life.

In 1 John 2:21, the writing assumes readers know the truth—linking to 5:13's goal of knowing you have eternal life through truth.

1 John 3:14 provides another way of knowing we have eternal life—through love—complementing the assurance from belief here.

In 1 John 2:26, the writing warns against deceivers—showing the letter's dual purpose: assurance and protection from false teaching.

In 1 John 2:14, the past tense 'I have written' parallels the present 'I write' in 5:13, reinforcing the consistent teaching to various groups.

In 1 John 2:13, the same 'I write to you' addresses fathers, young men, children—showing the varied audience receiving the assurance of eternal life.

Galatians 4:6 confirms sonship through the Spirit's cry of 'Abba, Father,' echoing the assurance of inheritance.

In 1 Timothy 1:15, Christ came to save sinners — the saving work that makes eternal life possible for those who believe in his name.

In 1 Timothy 1:16, Paul says Christ's patience is an example for those who believe and receive eternal life — directly echoing the assurance in 1 John 5:13.

Romans 8:15-17 reveals the Spirit's witness of adoption, providing another basis for knowing we are heirs of eternal life.

In Acts 4:12, salvation is only in Jesus' name — the exclusive basis for the eternal life assurance in 1 John 5:13.

In John 20:31, the Gospel's purpose is written 'that you may believe... and have life'—directly paralleling 1 John 5:13's assurance of eternal life to believers.

In John 3:18, faith in Jesus' name brings no condemnation — the same truth underlying the assurance of eternal life in 1 John 5:13.

In John 1:12, belief in Jesus' name grants sonship — the same belief that assures eternal life in 1 John 5:13.

John 3:15 states the same promise: belief in the Son brings eternal life, reinforcing the assurance here.

Galatians 3:22 makes faith in Jesus Christ the means to receive the promise, aligning with the faith that gives eternal life assurance here.

John 19:35 testifies of Christ so that readers may believe, aligning with the evangelistic purpose behind the assurance given here.

John 10:28 promises eternal life and security in Christ's hand, directly supporting the assurance of eternal life here.

John 6:47 echoes the same truth: whoever believes has eternal life, supporting the certainty John writes about.

2 Peter 1:11 promises entrance into the eternal kingdom, the ultimate outcome of the eternal life assured in 1 John 5:13.

2 Peter 1:10 urges believers to confirm their calling and election, complementing the certainty with active diligence.

In 1 Peter 5:12, Peter similarly states his letter's purpose: testifying to true grace and encouraging steadfastness, echoing John's aim to give assurance.

2 Corinthians 5:1 assures of an eternal heavenly dwelling, reinforcing the hope of eternal life after death.