1 Corinthians 9:1 directly defends Paul's apostleship and his claim to have seen Jesus, reinforcing this opening.

1 Corinthians 9:2 calls the Corinthians the seal of Paul's apostleship, providing evidence for his claim here.

1 Corinthians 15:9 humbly acknowledges Paul as least of the apostles, contrasting with the bold declaration of his calling here.

Acts 22:21 records Christ sending Paul to the Gentiles — the specific apostolic commission Paul references here.

Romans 1:1 opens with Paul's identical self-identification as called apostle of Christ Jesus, mirroring this introduction.

Romans 1:5 parallels Paul's receipt of grace and apostleship for the Gentile mission, affirming the same calling.

2 Corinthians 1:1 repeats the exact phrase 'by the will of God', reinforcing Paul's consistent apostolic self-identification.

Galatians 1:1 also emphasizes apostleship through God's will, not human appointment — reinforcing Paul's claim here.

Galatians 1:15 describes Paul's divine separation and calling by grace, directly paralleling the 'called by will of God' in the greeting.

Ephesians 1:1 opens with the same formula 'by the will of God', confirming Paul's consistent self-identification as apostle.

Colossians 1:1 also begins with 'by the will of God', mirroring the greeting in 1 Corinthians.

1 Timothy 1:1 opens with a nearly identical apostolic greeting, emphasizing Paul's divine commissioning by God's command.

Acts 18:17 introduces Sosthenes as a synagogue ruler beaten in Corinth — the same Sosthenes now co-sending this letter as a Christian brother.

Galatians 1:16 reveals the purpose of Paul's calling — to preach Christ among the Gentiles, expanding on the apostolic mission.

1 Timothy 2:7 expands on Paul's apostolic role as teacher of the Gentiles, specifying the purpose of his calling.

Luke 6:13 records Jesus choosing and naming the twelve apostles, grounding the office Paul later claims.