1 John 1:1 describes the firsthand experience of the Word of life, which 1:3 declares as 'seen and heard' for fellowship.

In 1 John 1:7, the same fellowship (koinonia) is applied to walking in light and cleansing from sin, developing the theme of shared life with God and others.

In 1 John 1:6, claiming fellowship while walking in darkness is a lie — directly contrasts the genuine fellowship proclaimed in verse 3.

1 John 1:5 begins another declaration ('this is the message'), continuing the pattern of proclaiming what was received from Christ.

1 John 5:11 states the testimony that eternal life is in the Son, which is the content of what was proclaimed for fellowship.

In 1 John 2:24, abiding in the Son and Father is tied to keeping the original message, directly continuing the call to fellowship from the apostolic proclamation here.

In 1 John 2:23, denying or confessing the Son determines having the Father, reinforcing the inseparable fellowship with Father and Son stated here.

1 John 5:10 links belief in the Son to having the testimony within, showing the internal result of the proclamation that leads to fellowship.

1 John 2:1 introduces Jesus as advocate when we sin — builds on the fellowship from verse 3 by providing its ongoing basis.

Acts 4:20 echoes the same apostolic compulsion: 'we cannot but speak what we have seen and heard'—identical witness.

Hebrews 3:14 says we share in Christ if we hold our confidence firm, adding a conditional aspect to the fellowship.

Philippians 2:1 appeals to participation (koinonia) in the Spirit — the same fellowship with God that 1 John proclaims.

2 Corinthians 13:14 includes the fellowship of the Holy Spirit, adding the third Person to the fellowship with Father and Son.

1 Corinthians 15:1 recalls the gospel Paul preached — the same foundational message that 1 John proclaims for fellowship.

In 1 Corinthians 1:9, God calls believers into fellowship with His Son, reinforcing that this fellowship is a divine calling.

Acts 2:42 describes devotion to apostles' teaching and fellowship (koinonia) — the same shared life that 1 John offers.

In John 17:21, the prayer for believers to be in the Father and Son mirrors the fellowship here, showing its ultimate goal of divine unity.

In John 17:11, Jesus prays for believers to be one as He and the Father are one, echoing the unity and fellowship with God that underlies this verse.

In John 14:20-23, Jesus promises mutual indwelling with the Father for those who love him, giving deeper insight into the fellowship with Father and Son proclaimed here.

In Philemon 1:17, Paul calls Philemon his 'partner' (koinonos) — the same fellowship root as here, applied to Christian partnership.

Galatians 2:9 describes the right hand of fellowship (koinonia) in ministry, directly parallel to the shared fellowship John proclaims.

2 John 1:9 says abiding in teaching gives both Father and Son — a strong parallel to the fellowship with both proclaimed here.

In Psalm 66:16, the psalmist calls others to hear his testimony of God's work—a direct parallel to proclaiming what was seen and heard for fellowship.

1 Corinthians 10:16 directly describes participation (koinonia) in Christ's blood and body, exactly matching John's fellowship with the Son.

John 17:23 deepens the unity theme with mutual indwelling, directly echoing John's vision of shared fellowship with the Father and Son.

John 17:22 shows Jesus giving glory to believers so they may be one, mirroring the fellowship with God and each other that John proclaims.

In John 1:41, Andrew finds his brother and proclaims 'We have found the Messiah'—a direct example of proclaiming for fellowship.

In Luke 24:48, Jesus commissions the disciples as witnesses—the foundation for the apostolic proclamation of what was seen and heard.

In John 17:3, eternal life is defined as knowing the true God and Jesus Christ, a reality closely linked to the fellowship with Father and Son here.

Colossians 1:13 describes being transferred into the kingdom of the Son, analogous to entering into fellowship with Him.

Philippians 1:5 thanks for partnership (koinonia) in the gospel, a specific expression of the fellowship John extends to all believers.

1 Corinthians 9:23 speaks of sharing in the gospel's blessings, using the same koinonia concept found in John's fellowship language.

Acts 13:32 echoes the apostolic proclamation of fulfilled promise — the same message that creates fellowship in 1 John.

Colossians 1:12 gives thanks for being qualified to share in the saints' inheritance — a parallel participation concept to the fellowship with Father and Son here.

Philippians 2:2 calls for unity and same love, echoing John's desire that believers share fellowship with each other and with God.