Acts 15:23 is the council letter addressed to Syria and Cilicia — the exact regions Paul now strengthens.

In Acts 16:4, Paul continues this journey, delivering the Jerusalem decrees as part of the same strengthening mission.

Acts 16:5 directly states the result of Paul's work: the churches were strengthened and grew, echoing the main verse's purpose.

Acts 14:22 shows Paul earlier strengthening disciples' souls — the same core activity on a previous journey.

Acts 18:23 repeats the same phrase 'strengthening all the disciples' as Paul continues his missionary circuit.

Acts 18:18 has Paul sailing for Syria — the same region he strengthened earlier, showing his continued work there.

Acts 21:3 places Paul at Tyre in Syria — a later stop in the region he once strengthened.

Acts 20:2 describes Paul going through regions encouraging believers — a similar but more general strengthening pattern.

Gal 1:21 has Paul himself saying he went to Syria and Cilicia — a first-person account of this very journey.

2 Corinthians 11:28 describes Paul's daily care for all the churches — directly paralleling his activity of strengthening the churches in Syria and Cilicia.