Philippians 1:27 calls for a life worthy of the gospel, which Philippians 2:16 then specifies as holding fast to the word of life for a worthy outcome.

In Philippians 4:1, Paul calls them his joy and crown, showing their steadfastness is the reward of his labor.

1 John 1:1 uses the exact phrase 'word of life' to refer to Jesus personally, deepening the meaning of the gospel message Paul holds fast.

2 Timothy 2:15-17 urges rightly handling the word of truth and warns against empty talk — reinforcing Paul's call to hold fast the word of life without laboring in vain.

1 Thessalonians 3:5 shows Paul's fear that his labor might be in vain due to temptation, paralleling the same apostolic concern in Philippians 2:16.

1 Thessalonians 2:19 calls believers Paul's crown of boasting at Christ's coming, reinforcing the same eschatological joy in Philippians 2:16.

John 6:63 declares that Jesus' words are spirit and life — the same 'word of life' Paul calls believers to hold fast to.

John 6:68 confesses that Jesus has the words of eternal life — the very 'word of life' Paul exhorts believers to hold fast.

Romans 10:8-16 expands on the 'word of faith' that saves — directly paralleling Paul's 'word of life' and the necessity of proclamation.

Galatians 2:2 has Paul expressing the same concern to not run in vain regarding his gospel presentation, directly paralleling Philippians 2:16.

2 Corinthians 1:14 shows Paul boasting about believers on the day of the Lord, directly paralleling his pride in Philippians 2:16.

Daniel 12:3 promises that those who turn many to righteousness shine like stars — directly parallels Paul's boast about labor not in vain at the day of Christ.

Hebrews 12:1 uses the running race metaphor — directly parallels Paul's 'run in vain' from Philippians 2:16, urging endurance.

In 1 Corinthians 15:58, the direct statement that labor in the Lord is not in vain reinforces Paul's own words.

In 1 Corinthians 9:24, the race metaphor with a prize clarifies what it means to run not in vain.

In 1 Corinthians 1:8, God's sustaining to the end gives Paul confidence that his running was not in vain.

In John 4:36, the harvest metaphor shows labor yields eternal fruit, affirming that Paul's work is not in vain.

Isaiah 49:4 uses 'labor in vain' as the Servant's lament, which Paul adapts with confidence in Philippians 2:16.

Galatians 4:11 expresses Paul's fear of laboring in vain, contrasting with the confident hope in Philippians 2:16.

1 Thessalonians 5:23 prays for blamelessness at Christ's coming — directly echoing Paul's 'day of Christ' hope in Philippians 2:16.

2 John 1:8 warns against losing the reward of labor — the same concern as not running in vain. Both urge perseverance for eschatological reward.

1 Corinthians 9:26 uses the running metaphor for disciplined ministry, similar to Paul's desire not to run in vain in Philippians 2:16.

Acts 13:26 describes the message of salvation sent to the people — the same 'word of life' Paul urges believers to hold fast and proclaim.

Luke 12:8 promises acknowledgment for those who confess Christ — aligning with Paul's concern for faithful witness in holding the word of life.

Matthew 10:27 commands open proclamation of Christ's words — reinforcing Paul's call to hold forth the word of life publicly.

Matthew 5:16 urges letting light shine through good works — similar to holding forth the word of life as a witness to others.

1 Peter 1:23 emphasizes the imperishable word of God that brings new birth, echoing 'word of life' in Philippians 2:16 as the source of spiritual life.

1 Peter 2:9 describes believers as a royal priesthood proclaiming God's excellencies — similar to holding forth the word of life in Philippians 2:16.