Acts 18:19-21 records Paul's earlier short visit to Ephesus — Acts 19:1 marks his return there.

Acts 18:23 recounts Paul's journey through Galatia and Phrygia immediately before he arrives in Ephesus in Acts 19:1.

Acts 18:24-28 details Apollos's earlier ministry in Ephesus and Corinth, setting the stage for Paul's arrival in Acts 19:1.

In Acts 20:18, Paul recalls his first day in Asia, directly referencing his arrival in Ephesus from 19:1.

1 Cor 15:32 references Paul's fight with beasts at Ephesus, directly tied to his ministry there beginning in 19:1.

Ephesians 1:1 addresses the saints in Ephesus, the church Paul began on his arrival in 19:1.

1 Corinthians 1:12 reveals factionalism around Paul and Apollos — a direct outcome of Apollos's presence in Corinth mentioned in Acts 19:1.

1 Corinthians 3:4-7 teaches that Paul and Apollos are fellow workers — complementing the mention of both in Acts 19:1.

1 Cor 3:6 mentions Apollos watering what Paul planted — Apollos is last seen in Corinth at Acts 19:1, linking the two.

1 Corinthians 16:12 mentions Apollos's later reluctance to visit Corinth — a follow-up to his presence there in Acts 19:1.

1 Tim 1:3 urges Timothy to remain in Ephesus — later instruction for the city where Paul first arrived in 19:1.

2 Tim 1:18 mentions Onesiphorus' service in Ephesus, the city Paul entered in 19:1.