In 1 Corinthians 9:2, Paul directly answers his own question — the Corinthians themselves prove his apostleship.

In 1 Corinthians 9:3, Paul frames the following verses as his defense, directly extending the self-justification begun in 9:1.

In 1 Corinthians 4:15, Paul explicitly states he became their father in Christ through the gospel — the very work he points to here.

In 1 Corinthians 3:6, Paul says he planted the church in Corinth — directly supporting his question ‘Are you not the work of my ministry?’

In 1 Corinthians 1:1, Paul introduces himself as called to be an apostle — the very claim he defends in 9:1.

In 1 Corinthians 15:8, Paul specifies the resurrection appearance that grounds his claim to have seen the Lord.

In 1 Corinthians 15:9, Paul humbly calls himself the least apostle — both affirming and contrasting with the bold tone of 9:1.

In 2 Cor 12:11, Paul again insists he is not inferior to super-apostles—reinforcing his apostolic claim from 1 Cor 9:1.

In 2 Cor 11:5, Paul defends his apostleship against super-apostles—same context of defending his authority as in 1 Cor 9:1.

2 Timothy 1:11 echoes Paul's roles as preacher, apostle, and teacher, linking them to his suffering for the gospel.

In 2 Cor 12:12, Paul lists signs of a true apostle—providing evidence that supports his assertion of apostleship in 1 Cor 9:1.

In Galatians 1:1, Paul asserts his apostleship comes from Jesus Christ—paralleling his claim to have seen the Lord in 1 Cor 9:1.

Galatians 1:15-17 describes Paul's divine calling and his independence from other apostles—he did not go to Jerusalem but to Arabia, confirming his apostolic authority.

Galatians 2:7 shows that the Jerusalem apostles recognized Paul's mission to the Gentiles, parallel to Peter's to the circumcised, affirming his apostleship.

Galatians 2:8 emphasizes that God worked through Paul for the apostolate to the Gentiles just as through Peter for the circumcised.

1 Timothy 2:7 reaffirms Paul's appointment as a preacher, apostle, and teacher to the Gentiles, stressing the truth of his claim.

Acts 9:3 recounts the light from heaven that flashed around Paul on the road to Damascus—the moment he saw the risen Jesus, as he claims here.

In Romans 11:13, Paul declares himself apostle to the Gentiles—directly supporting his apostolic claim and his work among the Corinthians.

In Romans 1:5, Paul mentions receiving apostleship to call Gentiles—connecting to his claim that the Corinthians are the result of his work.

In Romans 1:1, Paul introduces himself as called to be an apostle—directly echoing his defense of apostolic identity in 1 Cor 9:1.

In Acts 26:16-18, Paul recounts the Lord’s commission at his conversion — the purpose behind the vision he references in his claim.

In Acts 22:15, Paul is commissioned as a witness of what he has seen—confirming his claim in 1 Cor 9:1 to have seen Jesus and his apostolic authority.

In Acts 22:14-15, Ananias declares that Paul was chosen to see the Righteous One — grounding his apostolic claim in divine appointment.

In Acts 22:6-8, Paul recounts his Damascus road encounter with the risen Christ — the very event behind his claim to have seen Jesus.

In Acts 14:4, Luke explicitly calls Paul and Barnabas apostles — confirming the title Paul claims in 9:1.

In Acts 13:2, the Holy Spirit sets apart Paul for missionary work — the commissioning that underlies his apostolic authority.

Acts 9:17 shows Ananias confirming the vision of Jesus on the road and Paul's filling with the Holy Spirit, validating his apostleship.

In Acts 9:15, God declares Paul a chosen instrument for the Gentiles — directly affirming his apostolic calling.

Acts 9:5 records Jesus' direct response: 'I am Jesus, whom you are persecuting,' confirming Paul's encounter with the Lord.

2 Corinthians 3:2 calls the Corinthians Paul's letter of recommendation—echoing 'you are my workmanship' in 9:1.

In Acts 18:8-11, the founding of the Corinthian church through Paul’s preaching is recorded — the historical basis for his claim.

2 Corinthians 10:14 reminds them Paul brought the gospel first—supporting his claim in 9:1 that they are his work.